create_tempfile: make sure that leading directories can be accessible by peers

In a shared repository, we should make sure adjust_shared_perm() is called
after creating the initial fan-out directories under objects/ directory.

Earlier an logico called the function only when mkdir() failed; we should
do so when mkdir() succeeded.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

sha1_file.c

@@ -2125,7 +2125,7 @@ static int create_tmpfile(char *buffer, size_t bufsiz, const char *filename)
 	if (fd < 0 && dirlen) {
 		/* Make sure the directory exists */
 		buffer[dirlen-1] = 0;
-		if (mkdir(buffer, 0777) && adjust_shared_perm(buffer))
+		if (mkdir(buffer, 0777) || adjust_shared_perm(buffer))
 			return -1;
 
 		/* Try again */