nfs4_proc_lookup_common is supposed to return a posix error, we have to
handle any error returned that isn't errno
Reported-by: NOlga Kornievskaia <kolga@netapp.com>
Signed-off-by: NFrank S. Filz <ffilzlnx@mindspring.com>
Signed-off-by: NDominique Martinet <dominique.martinet@cea.fr>
Signed-off-by: NTrond Myklebust <trond.myklebust@primarydata.com>