Remove duplicated wpa_s->conf->interworking check

wpas_add_interworking_elements() does not need to do this since the
caller is already checking whether Interworking is enabled.

Signed-off-by: Jouni Malinen <j@w1.fi>
diff --git a/wpa_supplicant/scan.c b/wpa_supplicant/scan.c
index ae534ff..3c6b2c7 100644
--- a/wpa_supplicant/scan.c
+++ b/wpa_supplicant/scan.c
@@ -418,9 +418,6 @@
 static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
 					   struct wpabuf *buf)
 {
-	if (wpa_s->conf->interworking == 0)
-		return;
-
 	wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
 	wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
 		      1 + ETH_ALEN);