shell32: shlfileop tests: avoid buffer overflows for paths

[Mikołaj Zalewski]

>> @@ -329,8 +329,8 @@ static void test_delete(void)
>>  static void test_rename(void)
>>  {
>>      SHFILEOPSTRUCTA shfo, shfo2;
>> -    CHAR from[MAX_PATH];
>> -    CHAR to[MAX_PATH];
>> +    CHAR from[5*MAX_PATH];
>> +    CHAR to[5*MAX_PATH];
>>      DWORD retval;
>>
>>      shfo.hwnd = NULL;
>>
>
> This is really hacky.  If this is fixed, it needs to be fixed properly.
>
  I thought this is enough - we never put more that three paths in the 
buffer and tester probably won't have paths longer than MAX_PATH as they 
are not supported by the shell.
  What do you mean by a proper fix - some overflow checking in 
set_curr_dir_path and skipping the rest of tests in such a case?

Mikolaj Zalewski