fix nil crash

Signed-off-by: Nliyufan <liyufan5@huawei.com>

wpa_supplicant-2.9_standard/src/drivers/driver_nl80211.c

@@ -4980,6 +4980,9 @@ static int nl80211_put_freq_params(struct nl_msg *msg,
 static int nl80211_set_channel(struct i802_bss *bss,
 			       struct hostapd_freq_params *freq, int set_chan)
 {
+	if (bss == NULL || freq == NULL) {
+		return -1;
+	}
 	struct wpa_driver_nl80211_data *drv = bss->drv;
 	struct nl_msg *msg;
 	int ret;

wpa_supplicant-2.9_standard/src/drivers/driver_nl80211_capa.c

@@ -2461,6 +2461,9 @@ struct hostapd_hw_modes *
 nl80211_get_hw_feature_data(void *priv, u16 *num_modes, u16 *flags,
 			    u8 *dfs_domain)
 {
+	if (priv == NULL) {
+	    return NULL;
+	}
 	u32 feat;
 	struct i802_bss *bss = priv;
 	struct wpa_driver_nl80211_data *drv = bss->drv;