tty: Refactor session leader SIGHUP from __tty_hangup()
Reduce complexity of __tty_hangup(); separate SIGHUP signalling into tty_signal_session_leader(). Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Acked-by: Jiri Slaby <jslaby@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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