[Patch]Unref GIOChannel in g_at_chat_new_from_tty

[Zhang, Zhenhua]

Hi,

Attached is the patch to unref GIOChannel in g_at_chat_new_from_tty. If the 
GAtChat is created from g_at_chat_new, the reference count of channel is 
increased by g_io_add_watch_full(channel), so we need to unref it.

If GAtChat is failed to create, we also need to unref channel to free it.

Please review it.

Regards,
Zhenhua
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