[Fontconfig] Patch: fix double free (spotted by Coverity)

[Frederic Crozat]

Ok, second day of Coverity fixes.

First patch fixes three memleaks in fcpat.c (Coverity defect #1820,
#1821, #1822) when malloc fails.

-- 
Frederic Crozat <fcrozat at mandriva.com>
Mandriva
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