校验：count不应为负数的校验

game-server/app/servers/guild/handler/guildTrainHandler.ts

@@ -352,6 +352,7 @@ export class GuildTrainHandler {
     //购买挑战次数
     async purchaseTrainCount(msg: guildInter & { count: number }, session: BackendSession) {
         let { count, myUserGuild } = msg;
+        if( count < 0) return resResult(STATUS.WRONG_PARMS);
         const roleId: string = session.get('roleId');
         const serverId: number = parseInt(session.get('serverId'));
         const sid: string = session.get('sid');