In nfs_nget() if two threads race on the same filehandle, the loser should

cause the nfsnode to get freed. This fixes a potential vnode (and nfsnode)
leak in that path.

Submitted by:	Mohan Srinivasan
Reviewed by:	phk

sys/nfsclient/nfs_node.c

@@ -154,7 +154,8 @@ nfs_nget(struct mount *mntp, nfsfh_t *fhp, int fhsize, struct nfsnode **npp)
 		return (error);
 	if (nvp != NULL) {
 		*npp = VTONFS(nvp);
-		/* XXX I wonder of nfs_reclaim will survive the unused vnode */
+		/* vrele() the duplicate allocated here, to get it recycled */
+		vrele(vp);
 		return (0);
 	}
 	if (fhsize > NFS_SMALLFH) {