staging: wfx: fix error reporting in wfx_start_ap()

If AP did not start, the error was not reported to mac80211.
Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200515083325.378539-17-Jerome.Pouiller@silabs.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wfx/sta.c

@@ -476,14 +476,17 @@ int wfx_start_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
 {
 	struct wfx_vif *wvif = (struct wfx_vif *)vif->drv_priv;
 	struct wfx_dev *wdev = wvif->wdev;
+	int ret;
 
 	wvif =  NULL;
 	while ((wvif = wvif_iterate(wdev, wvif)) != NULL)
 		wfx_update_pm(wvif);
 	wvif = (struct wfx_vif *)vif->drv_priv;
 	wfx_upload_ap_templates(wvif);
-	hif_start(wvif, &vif->bss_conf, wvif->channel);
-	return 0;
+	ret = hif_start(wvif, &vif->bss_conf, wvif->channel);
+	if (ret > 0)
+		return -EIO;
+	return ret;
 }
 
 void wfx_stop_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif)