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mt7601u_mac_stop_hw should stop polling the rxq once it remains empty but instead continues polling after the rxq status stays clear; bringing down the interface takes about six seconds from this alone. Speed up path by exiting rxq loop once status repeatedly polls empty. Signed-off-by: Anthony Romano <anthony.romano@coreos.com> Reviewed-by: Jakub Kicinski <kubakici@wp.pl> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>