- No need to WANTPARENT when we're just going to vrele it in a deadlock

prone way later.

Reported by:	kkenn
MFC After:	3 days

sys/fs/nullfs/null_vfsops.c

@@ -112,7 +112,7 @@ nullfs_mount(struct mount *mp, struct thread *td)
 	/*
 	 * Find lower node
 	 */
-	NDINIT(ndp, LOOKUP, FOLLOW|WANTPARENT|LOCKLEAF,
+	NDINIT(ndp, LOOKUP, FOLLOW|LOCKLEAF,
 		UIO_SYSSPACE, target, td);
 	error = namei(ndp);
 	/*
@@ -130,9 +130,6 @@ nullfs_mount(struct mount *mp, struct thread *td)
 	 */
 	lowerrootvp = ndp->ni_vp;
 
-	vrele(ndp->ni_dvp);
-	ndp->ni_dvp = NULLVP;
-
 	/*
 	 * Check multi null mount to avoid `lock against myself' panic.
 	 */