Milter-greylist

Benoit Branciard a \ufffdcrit :
> 
> Still investigating...
> 

... Found !

in curl_outlet(), if the output buffer length was null, two chars were 
pre-allocated for an trailing \r\0.

The problem was that on subsequent calls of this function, those chars 
were ignored in the buffer length calculation, so that data were written 
at the wrong offset, inserting two uninitialized chars in the middle of 
the buffer.

This happened more or less frequently depending on the number of calls 
to curl_outlet() libcurl did to fill the complete answer.

The attached patch contains a possible fix, as well as a a bit of code 
to handle \r\n responses, and a typo fix.


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