[Fontconfig] patch: destroy ~/.fonts.cache-2 if it doesn't start with FC_GLOBAL_MAGIC_COOKIE or no string can be read at all from that file.

[Mike FABIAN]

A colleague again had a problem with a apparently broken
~/.fonts.cache-2 file. The file is here:

http://lisa.goe.net/~mfabian/.fonts.cache-2-T42p-JP

The file is huge (78 Megabytes) and apparently broken, as it doesn't
start with FC_GLOBAL_MAGIC_COOKIE.

When calling

    fc-match sans

this took a lot of time *always* the broken file was never fixed.
Actually it grew bigger and bigger all the time.

I believe if FcGlobalCacheLoad () cannot read any string at all from
~/.fonts.cache-2 or if the file does not start with
FC_GLOBAL_MAGIC_COOKIE it should exit with "goto bail_and_destroy;" to
delete the broken file instead of just "return;".

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-- 
Mike FABIAN   <mfabian at suse.de>   http://www.suse.de/~mfabian
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