[PATCH] ui/sdl2: fix surface_gl_update_texture: Assertion 'gls' failed

[marcandre . lureau]

From: Marc-André Lureau <marcandre.lureau@redhat.com>

Before sdl2_gl_update() is called, sdl2_gl_switch() may decide to
destroy the console window and its associated shaders.

Fixes:
https://gitlab.com/qemu-project/qemu/-/issues/1644

Fixes: commit c84ab0a5 ("ui/console: optionally update after gfx switch")

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
 ui/sdl2-gl.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ui/sdl2-gl.c b/ui/sdl2-gl.c
index b36ba6415a..cc83c98349 100644
--- a/ui/sdl2-gl.c
+++ b/ui/sdl2-gl.c
@@ -67,6 +67,10 @@ void sdl2_gl_update(DisplayChangeListener *dcl,
 
     assert(scon->opengl);
 
+    if (!scon->real_window) {
+        return;
+    }
+
     SDL_GL_MakeCurrent(scon->real_window, scon->winctx);
     surface_gl_update_texture(scon->gls, scon->surface, x, y, w, h);
     scon->updates++;
-- 
2.40.1