Fix the issue by resetting the reloading false first and then returning error directly instead of calling Macro

Fix the review comment

Fix the clang format

Update as per review comment

modules/gdscript/gdscript.cpp

@@ -755,7 +755,12 @@ Error GDScript::reload(bool p_keep_state) {
 		has_instances = instances.size();
 	}
 
-	ERR_FAIL_COND_V(!p_keep_state && has_instances, ERR_ALREADY_IN_USE);
+	// Check condition but reset flag before early return
+	if (!p_keep_state && has_instances) {
+		reloading = false; // Reset flag before returning
+
+		ERR_FAIL_V_MSG(ERR_ALREADY_IN_USE, "Cannot reload script while instances exist.");
+	}
 
 	String basedir = path;