malloc 正常申请内存，也判断了是否申请成功
之后关于free问题：
- if(p != NULL){
- free(p);
- p = NULL;
- }
假如这样释放会出来错误如下
假如free的时候去掉if条件，它还是会出来上面的错误。
之前在网上貌似 有说假如是NULL的话free的话相当于啥都没做，是不会出错的。
假如是if(!p)的话就不会出来图片上的错误。
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