Bluetooth: Use variable name instead of type in sizeof()

As written in the CodingStyle doc.

Signed-off-by: Szymon Janc <szymon.janc@tieto.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 6dd0152..f69dbcb 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -1035,7 +1035,7 @@
 		goto failed;
 	}
 
-	err = hci_send_cmd(hdev, HCI_OP_PIN_CODE_NEG_REPLY, sizeof(bdaddr_t),
+	err = hci_send_cmd(hdev, HCI_OP_PIN_CODE_NEG_REPLY, sizeof(cp->bdaddr),
 								&cp->bdaddr);
 	if (err < 0)
 		mgmt_pending_remove(cmd);