NFSv4: Clean up delegation recall error handling

Unify the error handling in nfs4_open_delegation_recall and
nfs4_lock_delegation_recall.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --cc fs/nfs/delegation.c
Simple merge

diff --cc fs/nfs/delegation.h
Simple merge

diff --cc fs/nfs/nfs4proc.c
Simple merge