Add comment for 'wiphy_get_vwifi_vif'

Adjust position of function 'wiphy_get_vwifi_vif',
and add a comment for it.

Author: jychen0611

vwifi.c

@@ -390,6 +390,20 @@ static inline struct vwifi_vif *wdev_get_vwifi_vif(struct wireless_dev *wdev)
     return container_of(wdev, struct vwifi_vif, wdev);
 }
 
+/* helper function to retrieve vif from wiphy */
+static struct vwifi_vif *wiphy_get_vwifi_vif(struct wiphy *wiphy)
+{
+    struct wireless_dev *wdev;
+    struct vwifi_vif *vif = NULL;
+
+    list_for_each_entry (wdev, &wiphy->wdev_list, list) {
+        vif = container_of(wdev, struct vwifi_vif, wdev);
+        break; /* Assuming only one virtual interface is present */
+    }
+
+    return vif;
+}
+
 static inline u32 vwifi_mac_to_32(const u8 *mac)
 {
     u32 h = 3323198485U;
@@ -1843,19 +1857,6 @@ static int vwifi_delete_interface(struct vwifi_vif *vif)
     return 0;
 }
 
-static struct vwifi_vif *wiphy_get_vwifi_vif(struct wiphy *wiphy)
-{
-    struct wireless_dev *wdev;
-    struct vwifi_vif *vif = NULL;
-
-    list_for_each_entry (wdev, &wiphy->wdev_list, list) {
-        vif = container_of(wdev, struct vwifi_vif, wdev);
-        break; /* Assuming only one virtual interface is present */
-    }
-
-    return vif;
-}
-
 /* Set transmit power for the virtual interface */
 static int vwifi_set_tx_power(struct wiphy *wiphy,
                               struct wireless_dev *wdev,