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.c b/drivers/edac/edac_mc.c
index b10b45cc..889ce75 100644
--- a/drivers/edac/edac_mc.c
+++ b/drivers/edac/edac_mc.c
@@ -235,6 +235,8 @@
  */
 void edac_mc_free(struct mem_ctl_info *mci)
 {
+	debugf1("%s()\n", __func__);
+
 	edac_mc_unregister_sysfs_main_kobj(mci);
 }
 EXPORT_SYMBOL_GPL(edac_mc_free);