sunrpc/cache: fix recent breakage of cache_clean_deferred

commit 6610f720e9e8103c22d1f1ccf8fbb695550a571f
broke cache_clean_deferred as entries are no longer added to the
pending list for subsequent revisiting.

So put those requests back on the pending list.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

net/sunrpc/cache.c

@@ -671,8 +671,10 @@ void cache_clean_deferred(void *owner)
 	spin_lock(&cache_defer_lock);
 
 	list_for_each_entry_safe(dreq, tmp, &cache_defer_list, recent) {
-		if (dreq->owner == owner)
+		if (dreq->owner == owner) {
 			__unhash_deferred_req(dreq);
+			list_add(&dreq->recent, &pending);
+		}
 	}
 	spin_unlock(&cache_defer_lock);