wifi: b43legacy: clean up one inconsistent indenting

Eliminate the follow smatch warning:
drivers/net/wireless/broadcom/b43legacy/main.c:2947 b43legacy_wireless_core_stop() warn: inconsistent indenting

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220719075637.111716-1-yang.lee@linux.alibaba.com