Merge: nvme-multipath: fix suspicious RCU usage warning

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/7110

JIRA: https://issues.redhat.com/browse/RHEL-102648

A new regression fix appeared upstream for a recently backported nvme change.

```
  When I run the NVME over TCP test in virtme-ng, I get the following
  "suspicious RCU usage" warning in nvme_mpath_add_sysfs_link():

  This patch uses sleepable RCU version of helper list_for_each_entry_srcu()
  instead of list_for_each_entry_rcu() to fix it.

  Fixes: 4dbd2b2 ("nvme-multipath: Add visibility for round-robin io-policy")
```

Signed-off-by: Chris Leech <cleech@redhat.com>

Approved-by: John Meneghini <jmeneghi@redhat.com>
Approved-by: bgurney <bgurney@redhat.com>
Approved-by: CKI KWF Bot <cki-ci-bot+kwf-gitlab-com@redhat.com>

Merged-by: Augusto Caringi <acaringi@redhat.com>

Author: caringi

drivers/nvme/host/multipath.c

@@ -1055,7 +1055,8 @@ void nvme_mpath_add_sysfs_link(struct nvme_ns_head *head)
 	 */
 	srcu_idx = srcu_read_lock(&head->srcu);
 
-	list_for_each_entry_rcu(ns, &head->list, siblings) {
+	list_for_each_entry_srcu(ns, &head->list, siblings,
+				 srcu_read_lock_held(&head->srcu)) {
 		/*
 		 * Ensure that ns path disk node is already added otherwise we
 		 * may get invalid kobj name for target