Staging: hv: remove GetChannelOffers vmbus_driver callback

It's only ever set to one function, so just call that function instead.
Actually, that wrapper function only ever called vmbus_request_offers()
so just call that function instead, no need for a do-nothing
intermediate step here.

Cc: Haiyang Zhang <[e-mail]>
Cc: Hank Janssen <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/hv/vmbus.c

···
 static struct hv_device *gDevice; /* vmbus root device */
 
 /*
- * VmbusGetChannelOffers - Retrieve the channel offers from the parent partition
- */
-static void VmbusGetChannelOffers(void)
-{
-	vmbus_request_offers();
-}
-
-/*
  * VmbusChildDeviceAdd - Registers the child device with the vmbus
  */
 int VmbusChildDeviceAdd(struct hv_device *ChildDevice)
···
 	driver->Base.OnDeviceAdd	= VmbusOnDeviceAdd;
 	driver->Base.OnDeviceRemove	= VmbusOnDeviceRemove;
 	driver->Base.OnCleanup		= VmbusOnCleanup;
-	driver->GetChannelOffers	= VmbusGetChannelOffers;
 
 	/* Hypervisor initialization...setup hypercall page..etc */
 	ret = hv_init();

drivers/staging/hv/vmbus_api.h

···
 	/* Set by the caller */
 	int (*OnChildDeviceAdd)(struct hv_device *RootDevice,
 				struct hv_device *ChildDevice);
-
-	/* Set by the callee */
-	void (*GetChannelOffers)(void);
 };
 
 int VmbusInitialize(struct hv_driver *drv);

drivers/staging/hv/vmbus_drv.c

···
 		goto cleanup;
 	}
 
-
-	vmbus_drv_obj->GetChannelOffers();
-
+	vmbus_request_offers();
 	wait_for_completion(&hv_channel_ready);
 
 cleanup:
···
  */
 int vmbus_child_driver_register(struct driver_context *driver_ctx)
 {
-	struct vmbus_driver *vmbus_drv_obj = &g_vmbus_drv.drv_obj;
 	int ret;
 
 	DPRINT_INFO(VMBUS_DRV, "child driver (%p) registering - name %s",
···
 
 	ret = driver_register(&driver_ctx->driver);
 
-	vmbus_drv_obj->GetChannelOffers();
+	vmbus_request_offers();
 
 	return ret;
 }