NFSv4: nfs4_handle_delegation_recall_error should ignore EAGAIN

EAGAIN is a valid return code from nfs4_open_recover(), and should
be handled by nfs4_handle_delegation_recall_error by simply passing
it through.
Signed-off-by: NTrond Myklebust <trond.myklebust@primarydata.com>

fs/nfs/nfs4proc.c

@@ -1684,6 +1684,7 @@ static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct
 					"%d.\n", __func__, err);
 		case 0:
 		case -ENOENT:
+		case -EAGAIN:
 		case -ESTALE:
 			break;
 		case -NFS4ERR_BADSESSION: