now return 1 if there were errors

src/main.cpp

@@ -808,6 +808,10 @@ int main(int arg_count, char **arg_ptr) {
 			show_timings(&checker, &timings);
 		}
 
+		if (global_error_collector.count != 0) {
+			return 1;
+		}
+
 		return 0;
 	}