fix: return loaded pool count after sync operation

src/ctx/sync.c

@@ -113,5 +113,5 @@ size_t lm_ctx_sync(lm_ctx_t *ctx, bool do_update, lm_ctx_sync_callback_t callbac
     cur = cur->next;
   }
 
-  return true;
+  return loaded_count;
 }