util/mkhtemp: fix wrongful errno reset

on error state, i was resetting errno
unconditionally, which would then mask
the real error.

Signed-off-by: Leah Rowe <leah@libreboot.org>

util/libreboot-utils/lib/mkhtemp.c

@@ -479,7 +479,6 @@ sticky_hell:
 		errno = EPERM;
 
 	close_no_err(&dirfd);
-	errno = saved_errno;
 
 	return 0;
 }