Function silc_client_file_close
SYNOPSIS
SilcClientFileError silc_client_file_close(SilcClient client,
SilcClientConnection conn,
uint32 session_id);
DESCRIPTION
Closes file transmission session indicated by the `session_id'.
If file transmission is being conducted it will be aborted
automatically. This function is also used to close the session
after successful file transmission. This function can be used
also to reject incoming file transmission request.