Fixed error message.

activitypub.c

@@ -1513,7 +1513,7 @@ int process_input_message(snac *snac, xs_dict *msg, xs_dict *req)
     if (!valid_status(a_status)) {
         /* do not retry 'Delete' messages */
         if (strcmp(type, "Delete") == 0) {
-            srv_debug(1, xs_fmt("dropping 'Delete' message due to actor error", actor, a_status));
+            srv_debug(1, xs_fmt("dropping 'Delete' message due to actor error %s %d", actor, a_status));
             return -1;
         }