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	Sync OpenBSD patchset 1011:
Remove unused backoff code that doesn't do any good.
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		@@ -560,50 +560,6 @@ server_client_check_exit(struct client *c)
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	c->flags &= ~CLIENT_EXIT;
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}
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/*
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 * Check if the client should backoff. During backoff, data from external
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 * programs is not written to the terminal. When the existing data drains, the
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 * client is redrawn.
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 *
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 * There are two backoff phases - both the tty and client have backoff flags -
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 * the first to allow existing data to drain and the latter to ensure backoff
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 * is disabled until the redraw has finished and prevent the redraw triggering
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 * another backoff.
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 */
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void
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server_client_check_backoff(struct client *c)
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{
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	struct tty	*tty = &c->tty;
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	size_t		 used;
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	used = EVBUFFER_LENGTH(tty->event->output);
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	/*
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	 * If in the second backoff phase (redrawing), don't check backoff
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	 * until the redraw has completed (or enough of it to drop below the
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	 * backoff threshold).
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	 */
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	if (c->flags & CLIENT_BACKOFF) {
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		if (used > BACKOFF_THRESHOLD)
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			return;
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		c->flags &= ~CLIENT_BACKOFF;
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		return;
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	}
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	/* Once drained, allow data through again and schedule redraw. */
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	if (tty->flags & TTY_BACKOFF) {
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		if (used != 0)
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			return;
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		tty->flags &= ~TTY_BACKOFF;
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		c->flags |= (CLIENT_BACKOFF|CLIENT_REDRAWWINDOW|CLIENT_STATUS);
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		return;
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	}
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	/* If too much data, start backoff. */
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	if (used > BACKOFF_THRESHOLD)
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		tty->flags |= TTY_BACKOFF;
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}
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/* Check for client redraws. */
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void
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server_client_check_redraw(struct client *c)
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