Bluetooth: Fix for a leftover debug of pairing credentials

One of the LE Secure Connections security credentials was still using
the BT_DBG instead of SMP_DBG.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c
index 73643a6..96c7d51 100644
--- a/net/bluetooth/smp.c
+++ b/net/bluetooth/smp.c
@@ -300,7 +300,7 @@
 	if (err)
 		return err;
 
-	BT_DBG("res %16phN", res);
+	SMP_DBG("res %16phN", res);
 
 	return err;
 }