[PATCH] bcm43xx: fix netdev watchdog timeouts

The setup for running long periodic work has a bug that leads to
netdev watchdog tx timeouts. This change eliminates the timeouts.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Acked-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>