db_mysql: proper handling of mysql_next_result(...) return code

- it indicates the presence of another result if return is 0
- reported by  Maxim (simax), FS#434

(cherry picked from commit 37f0964278e925d5530563b38c82a57de1f7fa59)
(cherry picked from commit af4f84b84ca7601bd8124fe2e82d0718c7975313)

modules/db_mysql/km_dbase.c

@@ -197,7 +197,7 @@ static int db_mysql_store_result(const db1_con_t* _h, db1_res_t** _r)
 		db_mysql_free_result(_h, *_r);
 		*_r = 0;
 #if (MYSQL_VERSION_ID >= 40100)
-		while( mysql_more_results(CON_CONNECTION(_h)) && mysql_next_result(CON_CONNECTION(_h)) > 0 ) {
+		while( mysql_more_results(CON_CONNECTION(_h)) && mysql_next_result(CON_CONNECTION(_h)) == 0 ) {
 			MYSQL_RES *res = mysql_store_result( CON_CONNECTION(_h) );
 			mysql_free_result(res);
 		}
@@ -207,7 +207,7 @@ static int db_mysql_store_result(const db1_con_t* _h, db1_res_t** _r)
 
 done:
 #if (MYSQL_VERSION_ID >= 40100)
-	while( mysql_more_results(CON_CONNECTION(_h)) && mysql_next_result(CON_CONNECTION(_h)) > 0 ) {
+	while( mysql_more_results(CON_CONNECTION(_h)) && mysql_next_result(CON_CONNECTION(_h)) == 0 ) {
 		MYSQL_RES *res = mysql_store_result( CON_CONNECTION(_h) );
 		mysql_free_result(res);
 	}