Bluetooth: Classic: SMP: Set BT_LINK_KEY_SC only if BT_KEYS_SC is set

The flag `BT_LINK_KEY_SC` of LK will also be set when derive LK from
LTK.
It is a incorrect behavior.

The flag `BT_LINK_KEY_SC` should only be set if the flag `BT_KEYS_SC`
of LTK has been set.

Signed-off-by: Lyle Zhu <[email protected]>

Author: lylezhu2012

subsys/bluetooth/host/smp.c

@@ -844,7 +844,11 @@ static void sc_derive_link_key(struct bt_smp *smp)
 		bt_keys_link_key_clear(link_key);
 	}
 
-	link_key->flags |= BT_LINK_KEY_SC;
+	if (conn->le.keys->flags & BT_KEYS_SC) {
+		link_key->flags |= BT_LINK_KEY_SC;
+	} else {
+		link_key->flags &= ~BT_LINK_KEY_SC;
+	}
 
 	if (conn->le.keys->flags & BT_KEYS_AUTHENTICATED) {
 		link_key->flags |= BT_LINK_KEY_AUTHENTICATED;