ceph: fix ceph_set_acl()

If acl is equivalent to file mode permission bits, ceph_set_acl()
needs to remove any existing acl xattr. Use __ceph_setxattr() to
handle both setting and removing acl xattr cases, it doesn't return
-ENODATA when there is no acl xattr.
Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>

fs/ceph/acl.c

@@ -160,11 +160,7 @@ int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type)
 			goto out_dput;
 	}
 
-	if (value)
 	ret = __ceph_setxattr(dentry, name, value, size, 0);
-	else
-		ret = __ceph_removexattr(dentry, name);
-
 	if (ret) {
 		if (new_mode != old_mode) {
 			newattrs.ia_mode = old_mode;