[Fontconfig] Patch: fix memleak (spotted by Coverity)

[Frederic Crozat]

Ok, I swear, this is the last fix for today ;)

This patch fixes a memleak in FcConfigEvaluate with strings (Coverity
defect #1823).

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