b43: stop leds during suspend

[Kalle Valo]

> Call b43_leds_stop during suspend to avoid this WARN:
> 
> WARNING: CPU: 1 PID: 0 at net/mac80211/util.c:755 ieee80211_can_queue_work.isra.11+0x35/0x50 [mac80211]()
> queueing ieee80211 work while going to suspend
> 
>  [...]
> 
> Call Trace:
>  [<c165fb2a>] dump_stack+0x48/0x69
>  [<c1052f7b>] warn_slowpath_common+0x8b/0xc0
>  [<f9c30225>] ? ieee80211_can_queue_work.isra.11+0x35/0x50 [mac80211]
>  [<f9c30225>] ? ieee80211_can_queue_work.isra.11+0x35/0x50 [mac80211]
>  [<c1052fe3>] warn_slowpath_fmt+0x33/0x40
>  [<f9c30225>] ieee80211_can_queue_work.isra.11+0x35/0x50 [mac80211]
>  [<f9c30260>] ieee80211_queue_work+0x20/0x40 [mac80211]
>  [<f9f25d78>] b43_led_brightness_set+0x28/0x30 [b43]
>  [<c14f3835>] led_timer_function+0xd5/0xe0
>  [<c10cb534>] call_timer_fn+0xa4/0x4a0
> 
> Signed-off-by: Sabrina Dubroca <sd at queasysnail.net>

Thanks, applied to wireless-drivers-next.git.

Kalle Valo