in_serial: Don't save original termios
in_serial: Don't save original termios

Most of operating systems, expecting Linux,  will restore termios
if the process is terminated.

The line was intended for keeping original termios before process
shutdown, but we don't have a chance (callback) to recover it yet,
therefore it is a useless.

Signed-off-by: Takeshi HASEGAWA <80595b5c49522665976d35e515d02ac963124d00@gmail.com>

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