ACPI: Fix white space in a structure definition

Add a missing space in the definition of struct acpi_device_bus_id.

Signed-off-by: Lukas Wunner <lukas@wunner.de>
[ rjw: Subject and changelog ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index 60bda0d..1e6833a 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -88,7 +88,7 @@
 
 extern struct list_head acpi_bus_id_list;
 
-struct acpi_device_bus_id{
+struct acpi_device_bus_id {
 	char bus_id[15];
 	unsigned int instance_no;
 	struct list_head node;