r8169: verbose error message.

Signed-off-by: NFrancois Romieu <romieu@fr.zoreil.com>
Cc: Hayes Wang <hayeswang@realtek.com>

drivers/net/ethernet/realtek/r8169.c

@@ -865,7 +865,8 @@ static bool rtl_loop_wait(struct rtl8169_private *tp, const struct rtl_cond *c,
 		if (c->check(tp) == high)
 			return true;
 	}
-	netif_err(tp, drv, tp->dev, c->msg);
+	netif_err(tp, drv, tp->dev, "%s == %d (loop: %d, delay: %d).\n",
+		  c->msg, !high, n, d);
 	return false;
 }