staging: rtl8723bs: Remove unnecessary null check

Null check before kfree is redundant, so remove it.
This is detected by coccinelle.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Link: https://lore.kernel.org/r/20191010153325.16836-1-yuehaibing@huawei.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8723bs/os_dep/os_intfs.c

@@ -1121,8 +1121,7 @@ void rtw_ndev_destructor(struct net_device *ndev)
 {
 	DBG_871X(FUNC_NDEV_FMT "\n", FUNC_NDEV_ARG(ndev));
 
-	if (ndev->ieee80211_ptr)
-		kfree(ndev->ieee80211_ptr);
+	kfree(ndev->ieee80211_ptr);
 }
 
 void rtw_dev_unload(struct adapter *padapter)