Avoid a potential swapsPending underflow by incrementing it before
ScheduleSwap, which may complete it immediately. And be sure to
decrement it again in case the schedule failed.
Reported-by: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Reviewed-by: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>