scsi: ipr: Fix WARNING in ipr_init()

In the Linux kernel, the following vulnerability has been resolved:

scsi: ipr: Fix WARNING in ipr_init()

ipr_init() will not call unregister_reboot_notifier() when

pci_register_driver() fails, which causes a WARNING. Call

unregister_reboot_notifier() when pci_register_driver() fails.

notifier callback ipr_halt [ipr] already registered

WARNING: CPU: 3 PID: 299 at kernel/notifier.c:29

notifier_chain_register+0x16d/0x230

Modules linked in: ipr(+) xhci_pci_renesas xhci_hcd ehci_hcd usbcore

led_class gpu_sched drm_buddy video wmi drm_ttm_helper ttm

drm_display_helper drm_kms_helper drm drm_panel_orientation_quirks

agpgart cfbft

CPU: 3 PID: 299 Comm: modprobe Tainted: G W

6.1.0-rc1-00190-g39508d23b672-dirty #332

Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS

rel-1.15.0-0-g2dd4b9b3f840-prebuilt.qemu.org 04/01/2014

RIP: 0010:notifier_chain_register+0x16d/0x230

Call Trace:

<TASK>

__blocking_notifier_chain_register+0x73/0xb0

ipr_init+0x30/0x1000 [ipr]

do_one_initcall+0xdb/0x480

do_init_module+0x1cf/0x680

load_module+0x6a50/0x70a0

__do_sys_finit_module+0x12f/0x1c0

do_syscall_64+0x3f/0x90

entry_SYSCALL_64_after_hwframe+0x63/0xcd