NFSv4: If a delegated open fails, ensure that we return the delegation

 Unless of course the open fails due to permission issues.
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/nfs4proc.c

@@ -658,6 +658,8 @@ static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred
 	}
 	up_read(&nfsi->rwsem);
 	up_read(&clp->cl_sem);
+	if (err != -EACCES)
+		nfs_inode_return_delegation(inode);
 	return err;
 }