staging: rtl8723bs: core: Change NULL comparison to Boolean negation

Change NULL comparison to Boolean negation. Issue found with Coccinelle
using matchnull.cocci.
Signed-off-by: Nishka Dasgupta <nishka.dasgupta@yahoo.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8723bs/core/rtw_ap.c

@@ -782,12 +782,8 @@ void start_bss_network(struct adapter *padapter, u8 *pbuf)
 	/* check if there is wps ie, */
 	/* if there is wpsie in beacon, the hostapd will update beacon twice when stating hostapd, */
 	/* and at first time the security ie (RSN/WPA IE) will not include in beacon. */
-	if (NULL == rtw_get_wps_ie(
-		pnetwork->IEs+_FIXED_IE_LENGTH_,
-		pnetwork->IELength-_FIXED_IE_LENGTH_,
-		NULL,
-		NULL
-	))
+	if (!rtw_get_wps_ie(pnetwork->IEs+_FIXED_IE_LENGTH_,
+			    pnetwork->IELength-_FIXED_IE_LENGTH_, NULL, NULL))
 		pmlmeext->bstart_bss = true;
 
 	/* todo: update wmm, ht cap */