can: gs_usb: gs_usb_probe(): use descriptors of current altsetting

can: gs_usb: gs_usb_probe(): use descriptors of current altsetting

BugLink: https://bugs.launchpad.net/bugs/1861934
commit 2f361cd9474ab2c4ab9ac8db20faf81e66c6279b upstream.

Make sure to always use the descriptors of the current alternate setting
to avoid future issues when accessing fields that may differ between
settings.

Signed-off-by: Johan Hovold <johan@kernel.org>
Fixes: d08e973a77d1 ("can: gs_usb: Added support for the GS_USB CAN devices")
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>