D1: std.md5: corrections for the given example

[grauzone]

downs wrote:
> Stewart Gordon wrote:
>> downs wrote:
>> <snip>
>>> while (auto len = file.readBlock(buffer.ptr, buffer.sizeof))
>> <snip>
>>
>> md5_example_2.d(7): expression expected, not 'auto'
>> md5_example_2.d(7): found 'len' when expecting ')'
>> md5_example_2.d(7): found '=' instead of statement
>>
>> (this is line 7 after I removed comments and blank lines from your edit)
>>
>> Stewart.
> 
> God I'm stupid.
> 
> Sorry.
> 
> I guess I wish that worked.

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