ACPICA: Remove argument of acpi_os_wait_events_complete

Remove the unused argument of acpi_os_wait_events_complete.

Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/acpi/acpica/evxface.c b/drivers/acpi/acpica/evxface.c
index 90ae6d1..6a8b537 100644
--- a/drivers/acpi/acpica/evxface.c
+++ b/drivers/acpi/acpica/evxface.c
@@ -251,7 +251,7 @@
 	}
 	/* Make sure all deferred tasks are completed */
 
-	acpi_os_wait_events_complete(NULL);
+	acpi_os_wait_events_complete();
 
 	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 	if (ACPI_FAILURE(status)) {
@@ -699,7 +699,7 @@
 
 	/* Make sure all deferred tasks are completed */
 
-	acpi_os_wait_events_complete(NULL);
+	acpi_os_wait_events_complete();
 
 	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 	if (ACPI_FAILURE(status)) {