USB: gadget: udc: fix const issue in gadget_match_driver()

JIRA: https://issues.redhat.com/browse/RHEL-116016
Conflicts:
* Avoiding commit d69d804 ("driver core: have match() callback in
  struct bus_type take a const *") that constifies device_driver *drv

commit 5f5cc79
Author: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Wed, 21 May 2025 15:41:40 +0200

  gadget_match_driver() takes a const pointer, and then decides to cast it
  away into a non-const one, which is not a good thing to do overall.  Fix
  this up by properly setting the pointers to be const to preserve that
  attribute.

  Fixes: d69d804 ("driver core: have match() callback in struct bus_type take a const *")
  Link: https://lore.kernel.org/r/2025052139-rash-unsaddle-7c5e@gregkh
  Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Signed-off-by: Desnes Nunes <desnesn@redhat.com>

Author: Desnes Nunes

drivers/usb/gadget/udc/core.c

@@ -1570,7 +1570,7 @@ static int gadget_match_driver(struct device *dev, struct device_driver *drv)
 {
 	struct usb_gadget *gadget = dev_to_usb_gadget(dev);
 	struct usb_udc *udc = gadget->udc;
-	struct usb_gadget_driver *driver = container_of(drv,
+	const struct usb_gadget_driver *driver = container_of(drv,
 			struct usb_gadget_driver, driver);
 
 	/* If the driver specifies a udc_name, it must match the UDC's name */