detect: fix memory leak when parsing signature

Ticket: #5529

src/detect-engine.c

@@ -493,7 +493,6 @@ static void DetectFrameInspectEngineCopy(DetectEngineCtx *de_ctx, int sm_list, i
             }
 
             list->next = new_engine;
-            break;
         }
         t = t->next;
     }