NFSv4: remove unused variable flags in nfs4_retry_setlk()

Since now variable 'flags' is not used anymore, remove it as well.
Otherwise there is a compile warning "unused variable 'flags'".

Fixes: e1843f01 ("NFSv4.1: Again fix a race where CB_NOTIFY_LOCK fails to wake a waiter")
Signed-off-by: NJoseph Qi <joseph.qi@linux.alibaba.com>
Acked-by: NCaspar Zhang <caspar@linux.alibaba.com>

fs/nfs/nfs4proc.c

@@ -6886,7 +6886,6 @@ static int
 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
 {
 	int status = -ERESTARTSYS;
-	unsigned long flags;
 	struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
 	struct nfs_server *server = NFS_SERVER(state->inode);
 	struct nfs_client *clp = server->nfs_client;