EDAC: Unexport and make edac_subsys static

... and use the accessor instead.

Signed-off-by: Borislav Petkov <bp@suse.de>
diff --git a/drivers/edac/edac_module.c b/drivers/edac/edac_module.c
index 059b592..2b53680 100644
--- a/drivers/edac/edac_module.c
+++ b/drivers/edac/edac_module.c
@@ -95,11 +95,10 @@
  * 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)
 {