usb: gadget: udc: renesas_usb3: fix device leak at unbind

Make sure to drop the reference to the companion device taken during
probe when the driver is unbound.

Fixes: 39facfa ("usb: gadget: udc: renesas_usb3: Add register of usb role switch")
Cc: [email protected]	# 4.19
Cc: Yoshihiro Shimoda <[email protected]>
Signed-off-by: Johan Hovold <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: jhovold

drivers/usb/gadget/udc/renesas_usb3.c

@@ -2657,6 +2657,7 @@ static void renesas_usb3_remove(struct platform_device *pdev)
 	struct renesas_usb3 *usb3 = platform_get_drvdata(pdev);
 
 	debugfs_remove_recursive(usb3->dentry);
+	put_device(usb3->host_dev);
 	device_remove_file(&pdev->dev, &dev_attr_role);
 
 	cancel_work_sync(&usb3->role_work);