calling functions to support that with the following API notes:
* libssh2_publickey_shutdown(), libssh2_session_free() changed
to return an "int" to allow signaling of LIBSSH2_ERROR_EAGAIN.
* libssh2_scp_recv(), libssh2_scp_send_ex() and libssh2_sftp_init()
will loop in on libssh2_channel_free() when there is an error.
It is not possible to return LIBSSH2_ERROR_EAGAIN in this condition
in these 3 functions and not lose the original error code.
the recent commits converted the tabs to 4 spaces, which matched the
initial indent size. Other commits converted the tabs to 8 spaces, this
didn't match.
All the code has been converted to 4 space indents. No changes to line
lengths or actual code was performed. This is in preperation to my up
coming non-blocking work so my commits should only be code changes and
line lengths in the code I am working on.
