aio: add missing break for the IOCB_CMD_FDSYNC case

Looks like this got lost in a merge.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/aio.c

@@ -1785,6 +1785,7 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
 		break;
 	case IOCB_CMD_FDSYNC:
 		ret = aio_fsync(&req->fsync, iocb, true);
+		break;
 	case IOCB_CMD_POLL:
 		ret = aio_poll(req, iocb);
 		break;