FYI: fix null ptr deref for bogus .la file

[Ralf Wildenhues]

As this is an obvious bugfix, I applied this to all three branches
without previous asking.  :-)

(My rewrite of lalib parsing for HEAD might be resurrected eventually.)

Regards,
Ralf

2004-12-16  Ralf Wildenhues <address@hidden>

        * libltdl/ltdl.c (trim): Return error rather than do bogus
        null pointer arithmetic when parsing a malformed .la file.

Index: libltdl/ltdl.c
===================================================================
RCS file: /cvsroot/libtool/libtool/libltdl/ltdl.c,v
retrieving revision 1.227
diff -u -r1.227 ltdl.c
--- libltdl/ltdl.c      29 Nov 2004 21:06:24 -0000      1.227
+++ libltdl/ltdl.c      16 Dec 2004 10:10:51 -0000
@@ -901,6 +901,9 @@
 
   FREE (*dest);
 
+  if (!end)
+    return 1;
+
   if (len > 3 && str[0] == '\'')
     {
       tmp = MALLOC (char, end - str);