edac_core: Print debug messages at release calls

This is important to track a nasty bug at the free logic.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/edac/edac_mc_sysfs.c b/drivers/edac/edac_mc_sysfs.c
index 7024b87..ddd7652 100644
--- a/drivers/edac/edac_mc_sysfs.c
+++ b/drivers/edac/edac_mc_sysfs.c
@@ -712,6 +712,8 @@
  */
 void edac_mc_unregister_sysfs_main_kobj(struct mem_ctl_info *mci)
 {
+	debugf1("%s()\n", __func__);
+
 	/* delete the kobj from the mc_kset */
 	kobject_put(&mci->edac_mci_kobj);
 }