dlm: Avoid -Wflex-array-member-not-at-end warning

-Wflex-array-member-not-at-end was introduced in GCC-14, and we are
getting ready to enable it, globally.

Move the conflicting declaration to the end of the corresponding
structure. Notice that `struct dlm_message` is a flexible
structure, this is a structure that contains a flexible-array
member.

Fix the following warning:

fs/dlm/dlm_internal.h:609:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: David Teigland <teigland@redhat.com>

Author: GustavoARSilva

fs/dlm/dlm_internal.h

@@ -606,7 +606,6 @@ struct dlm_ls {
 
 	struct dlm_rsb		ls_local_rsb;	/* for returning errors */
 	struct dlm_lkb		ls_local_lkb;	/* for returning errors */
-	struct dlm_message	ls_local_ms;	/* for faking a reply */
 
 	struct dentry		*ls_debug_rsb_dentry; /* debugfs */
 	struct dentry		*ls_debug_waiters_dentry; /* debugfs */
@@ -665,6 +664,9 @@ struct dlm_ls {
 
 	int			ls_namelen;
 	char			ls_name[DLM_LOCKSPACE_LEN + 1];
+
+	/* Must be last --ends in a flexible-array member.*/
+	struct dlm_message	ls_local_ms;	/* for faking a reply */
 };
 
 /*