component/bt: fix crash when set device name NULL

components/bt/bluedroid/api/esp_bt_device.c

@@ -36,7 +36,9 @@ esp_err_t esp_bt_dev_set_device_name(const char *name)
     if (esp_bluedroid_get_status() != ESP_BLUEDROID_STATUS_ENABLED) {
         return ESP_ERR_INVALID_STATE;
     }
-    
+    if (!name){
+        return ESP_ERR_INVALID_ARG;
+    }
     if (strlen(name) > ESP_DEV_DEVICE_NAME_MAX) {
         return ESP_ERR_INVALID_ARG;
     }

examples/bluetooth/gatt_server/main/gatts_demo.c

@@ -313,7 +313,10 @@ static void gatts_profile_a_event_handler(esp_gatts_cb_event_t event, esp_gatt_i
         gl_profile_tab[PROFILE_A_APP_ID].service_id.id.uuid.len = ESP_UUID_LEN_16;
         gl_profile_tab[PROFILE_A_APP_ID].service_id.id.uuid.uuid.uuid16 = GATTS_SERVICE_UUID_TEST_A;
 
-        esp_ble_gap_set_device_name(TEST_DEVICE_NAME);
+        esp_err_t set_dev_name_ret = esp_ble_gap_set_device_name(TEST_DEVICE_NAME);
+        if (set_dev_name_ret){
+            ESP_LOGE(GATTS_TAG, "set device name failed, error code = %x", set_dev_name_ret);
+        }
 #ifdef CONFIG_SET_RAW_ADV_DATA
         esp_err_t raw_adv_ret = esp_ble_gap_config_adv_data_raw(raw_adv_data, sizeof(raw_adv_data));
         if (raw_adv_ret){