ACPI: acpi_watchdog: use LIST_HEAD for stack-allocated list

Replace the separate declaration of 'resource_list' and subsequent
INIT_LIST_HEAD() call with LIST_HEAD(), which declares and initializes
the list head in one idiomatic step. This reduces code verbosity and
aligns with common kernel coding patterns, without functional change.

Signed-off-by: Can Peng <pengcan@kylinos.cn>
[ rjw: Subject edits ]
Link: https://patch.msgid.link/20251209072757.3110467-1-pengcan@kylinos.cn
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Author: Can Peng

drivers/acpi/acpi_watchdog.c

@@ -103,7 +103,7 @@ void __init acpi_watchdog_init(void)
 {
 	const struct acpi_wdat_entry *entries;
 	const struct acpi_table_wdat *wdat;
-	struct list_head resource_list;
+	LIST_HEAD(resource_list);
 	struct resource_entry *rentry;
 	struct platform_device *pdev;
 	struct resource *resources;
@@ -125,8 +125,6 @@ void __init acpi_watchdog_init(void)
 	    wdat->pci_device != 0xff || wdat->pci_function != 0xff)
 		goto fail_put_wdat;
 
-	INIT_LIST_HEAD(&resource_list);
-
 	entries = (struct acpi_wdat_entry *)(wdat + 1);
 	for (i = 0; i < wdat->entries; i++) {
 		const struct acpi_generic_address *gas;