Remove negative name cache entry pointing to the target name, which

could be instantiated while tdvp was unlocked.

Reported by:	Rick Miller <vmiller at hostileadmin com>
Tested by:	pho
MFC after:	1 week

sys/fs/tmpfs/tmpfs_vnops.c

@@ -1297,6 +1297,7 @@ tmpfs_rename(struct vop_rename_args *v)
 	cache_purge(fvp);
 	if (tvp != NULL)
 		cache_purge(tvp);
+	cache_purge_negative(tdvp);
 
 	error = 0;
 

sys/ufs/ufs/ufs_vnops.c

@@ -1554,6 +1554,7 @@ ufs_rename(ap)
 	cache_purge(fvp);
 	if (tvp)
 		cache_purge(tvp);
+	cache_purge_negative(tdvp);
 
 unlockout:
 	vput(fdvp);