EDAC: Unexport and make edac_subsys static

... and use the accessor instead.
Signed-off-by: Borislav Petkov <bp@suse.de>

drivers/edac/edac_module.c

@@ -95,11 +95,10 @@ static void edac_workqueue_teardown(void)
  * sysfs object: /sys/devices/system/edac
  *	need to export to other files
  */
-struct bus_type edac_subsys = {
+static struct bus_type edac_subsys = {
 	.name = "edac",
 	.dev_name = "edac",
 };
-EXPORT_SYMBOL_GPL(edac_subsys);
 
 static int edac_subsys_init(void)
 {

include/linux/edac.h

@@ -28,7 +28,6 @@ struct device;
 extern int edac_op_state;
 extern int edac_err_assert;
 extern atomic_t edac_handlers;
-extern struct bus_type edac_subsys;
 
 extern int edac_handler_set(void);
 extern void edac_atomic_assert_error(void);