linux-phytec-fsl

serial: sh-sci: Fix up break timer scheduling race.

The break flag timer is presently added through add_timer() via the
interrupt and error paths, where it is possible to send multiple breaks
in rapid succession and trigger the timer pending BUG_ON(). This moves
over to a mod_timer() instead.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>