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

[Frederic Crozat]

The following patch fixes memory and file descriptor leaks (Coverity
reports #777 and #1826) in error cases for FcDirScanConfig.

Please review this patch carefully, as I used goto for bail conditions
and tried to call free functions only one time in the FcDirScanConfig
code (to ease code review in the future).
-- 
Frederic Crozat <fcrozat at mandriva.com>
Mandriva
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