staging: r8188eu: remove intf_start pointer

Remove the intf_start pointer that points to a media-specific start
function (pci, usb, sdio, ...). The r8188eu driver supports only usb.

We could call usb_intf_start directly instead of going through the
function pointer. usb_intf_start is just a call to rtl8188eu_inirp_init so
we can directly replace the intf_start pointer with rtl8188eu_inirp_init.
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com> # Edimax N150
Link: https://lore.kernel.org/r/20230206201800.139195-5-martin@kaiser.cxSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/include/drv_types.h

@@ -171,7 +171,6 @@ struct adapter {
 	s8	signal_strength;
 
 	void *cmdThread;
-	void (*intf_start)(struct adapter *adapter);
 	void (*intf_stop)(struct adapter *adapter);
 	struct  net_device *pnetdev;
 

drivers/staging/r8188eu/os_dep/os_intfs.c

@@ -631,8 +631,7 @@ static int _netdev_open(struct net_device *pnetdev)
 			pr_info("can't init mlme_ext_priv\n");
 			goto netdev_open_error;
 		}
-		if (padapter->intf_start)
-			padapter->intf_start(padapter);
+		rtl8188eu_inirp_init(padapter);
 
 		rtw_led_control(padapter, LED_CTL_NO_LINK);
 
@@ -684,8 +683,7 @@ static int  ips_netdrv_open(struct adapter *padapter)
 	if (status == _FAIL)
 		goto netdev_open_error;
 
-	if (padapter->intf_start)
-		padapter->intf_start(padapter);
+	rtl8188eu_inirp_init(padapter);
 
 	rtw_set_pwr_state_check_timer(&padapter->pwrctrlpriv);
 	_set_timer(&padapter->mlmepriv.dynamic_chk_timer, 5000);

drivers/staging/r8188eu/os_dep/usb_intf.c

@@ -152,11 +152,6 @@ static void usb_dvobj_deinit(struct usb_interface *usb_intf)
 
 }
 
-static void usb_intf_start(struct adapter *padapter)
-{
-	rtl8188eu_inirp_init(padapter);
-}
-
 static void usb_intf_stop(struct adapter *padapter)
 {
 	/* cancel in irp */
@@ -313,7 +308,6 @@ static int rtw_usb_if1_init(struct dvobj_priv *dvobj, struct usb_interface *pusb
 	SET_NETDEV_DEV(pnetdev, dvobj_to_dev(dvobj));
 	padapter = rtw_netdev_priv(pnetdev);
 
-	padapter->intf_start = &usb_intf_start;
 	padapter->intf_stop = &usb_intf_stop;
 
 	/* step read_chip_version */