ceph: return errors from posix_acl_equiv_mode() correctly

In order to return correct error code should replace variable ret
using err in error case.
Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

fs/ceph/acl.c

@@ -185,10 +185,10 @@ int ceph_pre_init_acls(struct inode *dir, umode_t *mode,
 		return err;
 
 	if (acl) {
-		int ret = posix_acl_equiv_mode(acl, mode);
-		if (ret < 0)
+		err = posix_acl_equiv_mode(acl, mode);
+		if (err < 0)
 			goto out_err;
-		if (ret == 0) {
+		if (err == 0) {
 			posix_acl_release(acl);
 			acl = NULL;
 		}