[PATCH] fix mkdtemp() return '\0' instead of 'NULL' when it fails

[Bryan Wu]

Hi folks:

When I do some LTP test on blackfin-uclinux platform with uClibc
support, I found the implemenation of function mkdtemp() conflict with
the manpages.

This is a normal test function call as below:
====================
if (mkdtemp(template) = NULL)
        printf("%s: mkdtemp(%s) failed; errno template, errno, strerror(errno));
====================

But I found the mkdtemp() of uClibc will never return NULL when it fails.
So I post this patch attached to fix this bug, IMO.

Thanks
-Bryan Wu
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