USB: Simplify USB ID table match

usb_device_match_id() supports being passed NULL tables, so no need to
check for it.

Signed-off-by: Bastien Nocera <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/core/generic.c

···
 	udrv = to_usb_device_driver(drv);
 	if (udrv == &usb_generic_driver)
 		return 0;
-	if (!udrv->id_table)
-		return 0;
 
 	return usb_device_match_id(udev, udrv->id_table) != NULL;
 }