NFSD: Put export if prepare_creds() fail

Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

fs/nfsd/nfsfh.c

@@ -209,8 +209,10 @@ static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp)
 		 * fix that case easily.
 		 */
 		struct cred *new = prepare_creds();
-		if (!new)
-			return nfserrno(-ENOMEM);
+		if (!new) {
+			error =  nfserrno(-ENOMEM);
+			goto out;
+		}
 		new->cap_effective =
 			cap_raise_nfsd_set(new->cap_effective,
 					   new->cap_permitted);