libs/wine/debug: Avoid over-allocating memory in default_dbgstr_wn.

[Tomas Carnecky]

Michael Karcher wrote:
> Am Dienstag, den 15.07.2008, 15:55 -0700 schrieb Dan Hipschman:
>>      if (n < 0) n = 0;
>>      size = 12 + min( 300, n * 5 );
>> -    dst = res = funcs.get_temp_buffer( n * 5 + 7 );
>> +    dst = res = funcs.get_temp_buffer( size );
> This looks like fixing an under-allocation, not over-allocation. The
> patched code allocates at least 5 bytes more, and never less than 312.

Never _more_ than 312, because MIN(300, x) <= 300.

tom