Comment 9 for bug 256508

Verified that the above patch fixed the problem in that it at least prevents the segfault and the thumbnail even works.

Verified by compiling the cairo from the commit just before this one, and then running firefox with the compiled library LD_LIBRARY_PATH'd in. doing File->Open File, and navigating to the directory with the bad file. With the commit before this, firefox crashes.. with this fix, it works.

So, this fixes the bug in cairo, but should error surfaces be getting down this far? i.e., does this point to another bug in librsvg or pango?

Thanks for the fix.