channel_read

hello,

Theres a problem in _libssh2_transport_read() that when the calling
function loops over it's return value (>0 in channel_read()) and nread
!= recv_amount but contains data, the next call to
_libssh2_transport_read() will block while waiting for more data.

For me, this breaks libssh2_channel_write() because it needs to "drain"
incoming data and as a result calls _libssh2_channel_read().

Seems there needs to be some way to let the calling function know that
the pending data was received without needing to wait for more.

Thanks,

-- 
Ben Kibbey (bjk) @ FreeNode/OFTC/Jabber
KeyID: 0xF2B33BEF
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