NFSv4/pnfs: Handle RPC allocation errors in nfs4_proc_layoutget

If rpc_run_task() fails due to an allocation error, then bail out early.

Fixes: 910ad38697 ("NFS: Fix memory allocation in rpc_alloc_task()")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

fs/nfs/nfs4proc.c

@@ -9615,6 +9615,8 @@ nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout)
 	nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0);
 
 	task = rpc_run_task(&task_setup_data);
+	if (IS_ERR(task))
+		return ERR_CAST(task);
 
 	status = rpc_wait_for_completion_task(task);
 	if (status != 0)