Fixing two memory leaks

These are 2 memory leaks related to prepared statements
* Resultset (MySQL_ResultSet() not deallocated
* mysql_stmt_free_result() is now correctly called

lib/MySQL_Session.cpp

@@ -2713,6 +2713,7 @@ void MySQL_Session::MySQL_Stmt_Result_to_MySQL_wire(MYSQL_STMT *stmt, MySQL_Conn
 	if (stmt_result) {
 		MySQL_ResultSet *MyRS=new MySQL_ResultSet(&client_myds->myprot, stmt_result, stmt->mysql, stmt);
 		bool resultset_completed=MyRS->get_resultset(client_myds->PSarrayOUT);
+		delete MyRS;
 	} else {
 		MYSQL *mysql=stmt->mysql;
 		// no result set

lib/mysql_connection.cpp

@@ -1337,11 +1337,11 @@ void MySQL_Connection::async_free_result() {
 		query.stmt_result=NULL;
 	}
 	if (query.stmt) {
+		mysql_stmt_free_result(query.stmt);
 	}
 	if (mysql_result) {
 		mysql_free_result(mysql_result);
 		mysql_result=NULL;
-		mysql_stmt_free_result(query.stmt);
 	}
 	async_state_machine=ASYNC_IDLE;
 	if (MyRS) {