reiserfs: don't use congestion_wait()

Block devices do not, in general, report congestion any more, so this
congestion_wait() is effectively just a sleep.

It isn't entirely clear what is being waited for, but as we only wait
when j_async_throttle is elevated, it seems reasonable to stop waiting
when j_async_throttle becomes zero - or after the same timeout.

So change to use wait_event_event_timeout() for waiting, and
wake_up_var() to signal an end to waiting.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: NeilBrown <[email protected]>
Signed-off-by: Jan Kara <[email protected]>

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