fix(wpa_supplicant): Fix some coverity issues in wpa_supplicant

1. Fix leak in SoftAP while sending SAE Confirm
2. Move NULL check before pointer is getting used
3. Remove some dead code

components/wpa_supplicant/src/ap/ieee802_11.c

@@ -179,6 +179,7 @@ static int auth_sae_send_confirm(struct hostapd_data *hapd,
 #ifdef ESP_SUPPLICANT
     if (sta->remove_pending) {
         reply_res = -1;
+        wpabuf_free(data);
     } else {
         if (sta->sae_data)
             wpabuf_free(sta->sae_data);