[PATCH] fix compiler warnings

[Nathan Scott <nscott@xxxxxxxxxx>]

The xfsprogs userspace builds have been generating hundreds of
warnings with recent gcc versions for some time, due to the
char signedness inconsistencies we have in places.  Here's a
patch to clean that up, so we can at least see the interesting
warnings cropping up now.

cheers.

-- 
Nathan

fix-gcc-warnings
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