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/i7core_edac.c b/drivers/edac/i7core_edac.c
index 11c61b4..b055997 100644
--- a/drivers/edac/i7core_edac.c
+++ b/drivers/edac/i7core_edac.c
@@ -2086,6 +2086,7 @@
 			edac_mc_del_mc(&i7core_dev->pdev[0]->dev);
 
 			/* Free data */
+			debugf1("%s: free structs\n");
 			kfree(mci->ctl_name);
 			edac_mc_free(mci);