libssh2_channel_receive_window_adjust() API problem

Hey

libssh2_channel_receive_window_adjust() is made to return an "unsigned long"
which is "the new size of the receive window":

   LIBSSH2_API unsigned long
   libssh2_channel_receive_window_adjust(LIBSSH2_CHANNEL * channel,
                                         unsigned long adjustment,
                                         unsigned char force);

Yet when used on a non-blocking socket it could fail to get completed and then
it'll return PACKET_EAGAIN, which is -37 turned into an unsigned long which is
a very large value and should thus confuse any application that cares about
this return value!

Does anyone has any clever ideas on how to change this without breaking the
API? Should we perhaps rather introduce a new function that actually as a
working API and just leave the current broken now to not cause problems with
existing apps?

-- 
  / daniel.haxx.se
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