WMI: initialize wmi_blocks.list even if ACPI is disabled

Even if we don't want to register the WMI driver, we should initialize
the wmi_blocks list to be empty, since we don't want the wmi helper
functions to oops just because that basic list has not even been set up.

With this, "find_guid()" will happily return "not found" rather than
oopsing all over the place, and the callers will then just automatically
return false or AE_NOT_FOUND as appropriate.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/acpi/wmi.c

@@ -673,11 +673,11 @@ static int __init acpi_wmi_init(void)
 {
 	acpi_status result;
 
+	INIT_LIST_HEAD(&wmi_blocks.list);
+
 	if (acpi_disabled)
 		return -ENODEV;
 
-	INIT_LIST_HEAD(&wmi_blocks.list);
-
 	result = acpi_bus_register_driver(&acpi_wmi_driver);
 
 	if (result < 0) {