ACPI: delete acpi_os_free(), use kfree() directly

Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/acpi/utilities/utalloc.c b/drivers/acpi/utilities/utalloc.c
index 7940fc1..5cff17d 100644
--- a/drivers/acpi/utilities/utalloc.c
+++ b/drivers/acpi/utilities/utalloc.c
@@ -166,10 +166,10 @@
 
 	/* Free memory lists */
 
-	acpi_os_free(acpi_gbl_global_list);
+	ACPI_FREE(acpi_gbl_global_list);
 	acpi_gbl_global_list = NULL;
 
-	acpi_os_free(acpi_gbl_ns_node_list);
+	ACPI_FREE(acpi_gbl_ns_node_list);
 	acpi_gbl_ns_node_list = NULL;
 #endif