usb: dwc3: gadget: Return -ESHUTDOWN on ep disable

The usb_request API clearly noted that removed requests due to disabled
endpoint should have -ESHUTDOWN status returned. Don't change this
behavior.

Fixes: b44c0e7f ("usb: dwc3: gadget: conditionally remove requests")
Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/3421859485cb32d77e2068549679a6c07a7797bc.1667875427.git.Thinh.Nguyen@synopsys.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>