scsi: mpi3mr: Fix mpi3mr_host_attrs struct

JIRA: https://issues.redhat.com/browse/RHEL-89712

A NULL termination pointer was removed mistakenly in a previous
backport. That causes KASAN to issue BUG warnings like this one:
[ 58.960262] BUG: KASAN: global-out-of-bounds in scsi_sysfs_add_host+0x179/0x1b0
[ 58.968701] Read of size 8 at addr ffffffffc069aab8 by task kworker/0:4/355
[ 58.977289]
[ 58.985716] CPU: 0 PID: 355 Comm: kworker/0:4 Not tainted 5.14.0-581.el9.x86_64+debug #1
[ 58.994420] Hardware name: Dell Inc. PowerEdge R6615/0WC07M, BIOS 1.9.5 09/12/2024
[ 59.003083] Workqueue: events work_for_cpu_fn
[ 59.011505] Call Trace:
[ 59.019773] <TASK>
[ 59.028130] dump_stack_lvl+0x57/0x81
[ 59.036376] print_address_description.constprop.0+0x8a/0x33b
[ 59.044620] print_report+0x125/0x20f
[ 59.052913] ? scsi_sysfs_add_host+0x179/0x1b0
[ 59.062740] ? srso_alias_return_thunk+0x5/0xfbef5
[ 59.071541] ? kasan_addr_to_slab+0x9/0xa0
[ 59.080738] ? scsi_sysfs_add_host+0x179/0x1b0
[ 59.089159] kasan_report+0x91/0xc0
[ 59.097749] ? scsi_sysfs_add_host+0x179/0x1b0
[ 59.107107] scsi_sysfs_add_host+0x179/0x1b0
[ 59.116150] scsi_add_host_with_dma.cold+0x6d2/0x6fc
[ 59.124572] mpi3mr_probe.part.0.cold+0x8b7/0x998 [mpi3mr]
...

Fix it by re-adding the pointer.

Upstream Status: RHEL only

Signed-off-by: Tomas Henzl <thenzl@redhat.com>

Author: thenzl

drivers/scsi/mpi3mr/mpi3mr_app.c

@@ -3265,6 +3265,7 @@ struct device_attribute *mpi3mr_host_attrs[] = {
 	&dev_attr_reply_queue_count,
 	&dev_attr_reply_qfull_count,
 	&dev_attr_logging_level,
+	NULL,
 };
 
 /*