[PATCH] fix bug #9833 - Function called in unix_convert() path can overwrite errno.

[Jeremy Allison]

Found (and fixed) by Anand Avati <avati at redhat.com> whilst writing his
GlusterFS VFS modules.

unix_convert() depends on errno not being modified by called functions in some
code paths.

Please give second Team Reviewed-by: tag and push if you're
happy.

Cheers,

	Jeremy.
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