ACPI: static acpi_chain_head

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/acpi/event.c b/drivers/acpi/event.c
index 5479dc0..abec1ca 100644
--- a/drivers/acpi/event.c
+++ b/drivers/acpi/event.c
@@ -110,7 +110,7 @@
 #endif	/* CONFIG_ACPI_PROC_EVENT */
 
 /* ACPI notifier chain */
-BLOCKING_NOTIFIER_HEAD(acpi_chain_head);
+static BLOCKING_NOTIFIER_HEAD(acpi_chain_head);
 
 int acpi_notifier_call_chain(struct acpi_device *dev, u32 type, u32 data)
 {