Removed redundant NULL check for sta in hostapd_event_sta_low_ack()

Signed-off-by: Nishant Chaprana <n.chaprana@samsung.com>

src/ap/drv_callbacks.c

@@ -471,8 +471,7 @@ void hostapd_event_sta_low_ack(struct hostapd_data *hapd, const u8 *addr)
 		       HOSTAPD_LEVEL_INFO,
 		       "disconnected due to excessive missing ACKs");
 	hostapd_drv_sta_disassoc(hapd, addr, WLAN_REASON_DISASSOC_LOW_ACK);
-	if (sta)
-		ap_sta_disassociate(hapd, sta, WLAN_REASON_DISASSOC_LOW_ACK);
+	ap_sta_disassociate(hapd, sta, WLAN_REASON_DISASSOC_LOW_ACK);
 }