xfs: Remove useless test

Q_XQUOTARM is never passed to xfs_fs_set_xstate() so remove the test.
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Jan Kara <jack@suse.cz>

fs/xfs/xfs_quotaops.c

@@ -75,7 +75,7 @@ xfs_fs_set_xstate(
 
 	if (sb->s_flags & MS_RDONLY)
 		return -EROFS;
-	if (op != Q_XQUOTARM && !XFS_IS_QUOTA_RUNNING(mp))
+	if (!XFS_IS_QUOTA_RUNNING(mp))
 		return -ENOSYS;
 
 	if (uflags & FS_QUOTA_UDQ_ACCT)