[ft] Regression introduced in 5f18d867c0 causing mpv to segfault

[Earnestly]

When testing freetype2 I found commit 5f18d867c0bf075153c8d6abb7e8d248a
([truetype] Do linear scaling for FT_LOAD_NO_HINTING (#50470)) resulted
in segmentation faults when using the mpv media player and attempting to
display its OSC (OnScreen Controller).  As I don't believe this is an
issue with mpv (or the libass library) I'm posting this here

Here is a backtrace from the affected software:

Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007f2e100e7b64 in tt_size_request (size=0x7f2df4412490, 
req=0x7f2dfe752140) at /shortened/freetype2/src/truetype/ttdriver.c:367
367                          : req->vertResolution;
[Current thread is 1 (Thread 0x7f2dfe753700 (LWP 19632))]
(gdb) bt full
#0  0x00007f2e100e7b64 in tt_size_request (size=0x7f2df4412490, 
req=0x7f2dfe752140) at /shortened/freetype2/src/truetype/ttdriver.c:367
        resolution = <optimized out>
        error = <optimized out>
        req = 0x7f2dfe752140
        size = 0x7f2df4412490
        error = <optimized out>
#1  0x00007f2e100d23cf in FT_Request_Size (address@hidden, address@hidden)
    at 
/home/earnest/build/store/freetype2-git/src/freetype2/src/base/ftobjs.c:3071
        clazz = <optimized out>
#2  0x00007f2e14096ebc in ass_face_set_size (address@hidden, size=<optimized 
out>) at ass_font.c:305
        hori = 0x7f2df48bb7e0
        os2 = <optimized out>
        mscale = 1
        rq = {type = FT_SIZE_REQUEST_TYPE_REAL_DIM, width = 0, height = 0, 
horiResolution = 0, vertResolution = 0}
        m = 0x7f2df44124a8
#3  0x00007f2e1409715d in add_face (address@hidden, font=0x7f2df48aaa70, 
address@hidden) at ass_font.c:220
        path = 0x7f2df80b5b30 "/usr/share/fonts/TTF/DejaVuSans.ttf"
        postscript_name = 0x7f2df80b5b10 "DejaVuSans"
        i = <optimized out>
        index = 0
        uid = 351
        error = <optimized out>
        stream = {func = 0x0, priv = 0x0}
        face = 0x7f2df48bb650
#4  0x00007f2e140973d2 in ass_font_new (font_cache=<optimized out>, 
library=0x7f2df8065b30, ftlibrary=0x7f2df8065960, fontsel=0x7f2df8068dc0, 
    address@hidden) at ass_font.c:255
        font = 0x7f2df48aaa70
        new_desc = <optimized out>
        error = <optimized out>
#5  0x00007f2e140a7855 in update_font (address@hidden) at ass_parse.c:132
        val = <optimized out>
        desc = {family = 0x7f2df4409f70 "sans-serif", bold = 400, italic = 0, 
vertical = 0}
#6  0x00007f2e1409d312 in reset_render_context (address@hidden, 
style=<optimized out>) at ass_render.c:858
No locals.
#7  0x00007f2e140aa335 in parse_tag (address@hidden, p=<optimized out>, 
    address@hidden "}{\\1a&H50&\\2a&HFF&\\3a&HFF&\\4a&HFF&}{\\p4} m 0 0 l 12819 
0 l 12819 448 l 0 448 l 0 0{\\p0}{}", address@hidden) at ass_parse.c:775
        len = <optimized out>
        q = 0x7f2df80f3d6c 
"\\blur0\\bord1\\1c&H000000\\3c&HFFFFFF}{\\1a&H50&\\2a&HFF&\\3a&HFF&\\4a&HFF&}{\\p4}
 m 0 0 l 12819 0 l 12819 448 l 0 448 l 0 0{\\p0}{}"
        name_end = 0x7f2df80f3d6c 
"\\blur0\\bord1\\1c&H000000\\3c&HFFFFFF}{\\1a&H50&\\2a&HFF&\\3a&HFF&\\4a&HFF&}{\\p4}
 m 0 0 l 12819 0 l 12819 448 l 0 448 l 0 0{\\p0}{}"
        args = {{
            start = 0x7f2df80f3d65 
"Default\\blur0\\bord1\\1c&H000000\\3c&HFFFFFF}{\\1a&H50&\\2a&HFF&\\3a&HFF&\\4a&HFF&}{\\p4}
 m 0 0 l 12819 0 l 12819 448 l 0 448 l 0 0{\---Type <return> to continue, or q 
<return> to quit---
\p0}{}", end = 0x7f2df80f3d6c 
"\\blur0\\bord1\\1c&H000000\\3c&HFFFFFF}{\\1a&H50&\\2a&HFF&\\3a&HFF&\\4a&HFF&}{\\p4}
 m 0 0 l 12819 0 l 12819 448 l 0 448 l 0 0{\\p0}{}"}, {
            start = 0x7f2e140b7ee8 "", end = 0x7f2e140b7ee8 ""}, {start = 
0x7f2e140b7ee8 "", end = 0x7f2e140b7ee8 ""}, {start = 0x7f2e140b7ee8 "", 
            end = 0x7f2e140b7ee8 ""}, {start = 0x7f2e140b7ee8 "", end = 
0x7f2e140b7ee8 ""}, {start = 0x7f2e140b7ee8 "", end = 0x7f2e140b7ee8 ""}, {
            start = 0x7f2e140b7ee8 "", end = 0x7f2e140b7ee8 ""}, {start = 
0x7f2e140b7ee8 "", end = 0x7f2e140b7ee8 ""}}
        nargs = 1
        __PRETTY_FUNCTION__ = "parse_tag"
#8  0x00007f2e1409dbb7 in parse_events (event=<optimized out>, 
render_priv=0x7f2df8067540) at ass_render.c:1842
        info = <optimized out>
        q = 0x7f2df80f3d8e "}{\\1a&H50&\\2a&HFF&\\3a&HFF&\\4a&HFF&}{\\p4} m 0 0 
l 12819 0 l 12819 448 l 0 448 l 0 0{\\p0}{}"
        text_info = 0x7f2df8067840
        drawing = 0x0
        code = 0
        p = 0x7f2df80f3d62 
"{\\rDefault\\blur0\\bord1\\1c&H000000\\3c&HFFFFFF}{\\1a&H50&\\2a&HFF&\\3a&HFF&\\4a&HFF&}{\\p4}
 m 0 0 l 12819 0 l 12819 448 l 0 448 l 0 0{\\p0}{}"
#9  ass_render_event (event_images=<optimized out>, event=<optimized out>, 
render_priv=0x7f2df8067540) at ass_render.c:2461
        device_y = 0
        bbox = {xMin = 0, xMax = 6.9087803142822647e-310, yMin = 
2.1239399353291325e-314, yMax = 6.9087841256730343e-310}
        MarginL = <optimized out>
        MarginR = <optimized out>
        MarginV = <optimized out>
        valign = <optimized out>
        device_x = 0
        text_info = 0x7f2df8067840
        max_text_width = <optimized out>
#10 ass_render_frame (priv=0x7f2df8067540, track=<optimized out>, 
now=<optimized out>, detect_change=<optimized out>) at ass_render.c:3015
        event = <optimized out>
        i = <optimized out>
        cnt = <optimized out>
        last = <optimized out>
        tail = <optimized out>