do not use exit() in Appl to avoid memory leaks

src/tools/ebusctl.cpp

@@ -123,7 +123,8 @@ int main(int argc, char* argv[])
 	define_args();
 
 	// parse arguments
-	A.parseArgs(argc, argv);
+	if (A.parseArgs(argc, argv) == false)
+		return EXIT_SUCCESS;
 
 	if (A.missingCommand() == true) {
 		cout << "interactive mode started." << endl;