mwifiex: remove unnecessary NULL check

ra_list cannot be NULL here, so remove the unnecessary NULL check.

Signed-off-by: Xinming Hu <[e-mail]>
Signed-off-by: Amitkumar Karwar <[e-mail]>
Signed-off-by: Kalle Valo <[e-mail]>

drivers/net/wireless/mwifiex/wmm.c

···
 			if (!memcmp(ra_list->ra, mac, ETH_ALEN))
 				continue;
 
-			if (ra_list && ra_list->tx_paused != tx_pause) {
+			if (ra_list->tx_paused != tx_pause) {
 				pkt_cnt += ra_list->total_pkt_count;
 				ra_list->tx_paused = tx_pause;
 				if (tx_pause)