Properly incref the torrent_file pointer so that we can use it even after it falls out of scope.
Properly incref the torrent_file pointer so that we can use it even after it
falls out of scope.

dylanvee/libtorrent-go,sharkone/libtorrent-go,waynus/libtorrent-go,waynus/libtorrent-go,anteo/libtorrent-go,waynus/libtorrent-go,steeve/libtorrent-go,dylanvee/libtorrent-go,steeve/libtorrent-go,anteo/libtorrent-go,sharkone/libtorrent-go,dylanvee/libtorrent-go,steeve/libtorrent-go,sharkone/libtorrent-go