NFSD: Map nfserr_wrongsec outside of nfsd_dispatch

Refactor: Handle this NFS version-specific mapping in the only
place where nfserr_wrongsec is generated.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

fs/nfsd/export.c

@@ -1002,7 +1002,7 @@ __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
 	if (nfsd4_spo_must_allow(rqstp))
 		return 0;
 
-	return nfserr_wrongsec;
+	return rqstp->rq_vers < 4 ? nfserr_acces : nfserr_wrongsec;
 }
 
 /*

fs/nfsd/nfssvc.c

@@ -964,8 +964,6 @@ static __be32 map_new_errors(u32 vers, __be32 nfserr)
 {
 	if (nfserr == nfserr_jukebox && vers == 2)
 		return nfserr_dropit;
-	if (nfserr == nfserr_wrongsec && vers < 4)
-		return nfserr_acces;
 	return nfserr;
 }