can: af_can: can_exit(): add missing dev_remove_pack() of canxl_packet

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2071839
Tested: This is one of a series of patch sets to enable Arm SystemReady IR
 support.  This set updates the CAN driver subsystem.  This set has
 been tested on NXP imx8mm and NV Jetson Xavier NX via simple boot
 tests, using cansend/candump from can-utils to pass messages through
 a virtual CAN interface, and of course the CI loop.

commit a3335fa
Author: Chen Zhongjin <chenzhongjin@huawei.com>
Date:   Mon Oct 31 11:30:53 2022 +0800

    can: af_can: can_exit(): add missing dev_remove_pack() of canxl_packet

    In can_init(), dev_add_pack(&canxl_packet) is added but not removed in
    can_exit(). It breaks the packet handler list and can make kernel
    panic when can_init() is called for the second time.

    | > modprobe can && rmmod can
    | > rmmod xxx && modprobe can
    |
    | BUG: unable to handle page fault for address: fffffbfff807d7f4
    | RIP: 0010:dev_add_pack+0x133/0x1f0
    | Call Trace:
    |  <TASK>
    |  can_init+0xaa/0x1000 [can]
    |  do_one_initcall+0xd3/0x4e0
    |  ...

    Fixes: fb08cba ("can: canxl: update CAN infrastructure for CAN XL frames")
    Signed-off-by: Chen Zhongjin <chenzhongjin@huawei.com>
    Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>
    Link: https://lore.kernel.org/all/20221031033053.37849-1-chenzhongjin@huawei.com
    [mkl: adjust subject and commit message]
    Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
    (cherry picked from commit a3335fa)

Signed-off-by: Al Stone <ahs3@redhat.com>

Author: Al Stone

net/can/af_can.c

@@ -902,6 +902,7 @@ static __init int can_init(void)
 static __exit void can_exit(void)
 {
 	/* protocol unregister */
+	dev_remove_pack(&canxl_packet);
 	dev_remove_pack(&canfd_packet);
 	dev_remove_pack(&can_packet);
 	sock_unregister(PF_CAN);