Fix a deadlock which can occur due to a pseudofs vnode not getting unlocked.

Reported by:	Richard Todd <rmtodd@ichotolot.servalan.com>
Reviewed by:	kib
Approved by:	kib

sys/fs/pseudofs/pseudofs_vncache.c

@@ -212,6 +212,7 @@ retry2:
 			if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, curthread) == 0) {
 				++pfs_vncache_hits;
 				vgone(*vpp);
+				vput(*vpp);
 				*vpp = vp;
 				cache_purge(vp);
 				return (0);