68328serial: remove unsed m68k_serial->tqueue_hangup
m68k_serial->tqueue_hangup is unused. Remove it. Signed-off-by: NTejun Heo <tj@kernel.org> Cc: Greg Ungerer <gerg@uclinux.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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