staging: rtl8192u: remove null check after call container_of()

container_of() will never return NULL, so remove useless code.

Signed-off-by: Haowen Bai <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c

···
 	unsigned long flags, flags2;
 
 	ieee = container_of(work, struct ieee80211_device, ps_task);
-	if (!ieee)
-		return;
 
 	spin_lock_irqsave(&ieee->lock, flags);