[Xcb] Get rid of PATH_MAX and MAXPATHLEN

[Arnaud Fontaine]

Hi Peter,

    >   Unfortunately, I  don't  think  this is  quite  the final  patch
    > yet. When  you changed the while() to an if(),  you forgot to call
    > func() again after the realloc is successful.

Fixed. I just returns NULL  if actual_socknamelen > socknamelen but this
should not happen... Hope that's ok now

Cheers,
-- 
Arnaud Fontaine (arnau)

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