NFS: remove pointless if statement in nfs_direct_write_result

The code was doing nothing more in either branch of the if.
Signed-off-by: NFred Isaman <iisaman@netapp.com>
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/direct.c

@@ -649,8 +649,7 @@ static void nfs_direct_write_result(struct rpc_task *task, void *calldata)
 {
 	struct nfs_write_data *data = calldata;
 
-	if (nfs_writeback_done(task, data) != 0)
-		return;
+	nfs_writeback_done(task, data);
 }
 
 /*