[PATCH] kNFSd: Convert error status for failed lookup("..") properly.

From: NeilBrown <neilb@cse.unsw.edu.au>

We weren't converting the -E* error code to an nfserr_* error code as we
should.

fs/nfsd/vfs.c

@@ -173,7 +173,7 @@ nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name,
 				err = PTR_ERR(exp2);
 				dput(dentry);
 				mntput(mnt);
-				goto out;
+				goto out_nfserr;
 			}
 			if (!exp2) {
 				dput(dentry);