net: vertexcom: mse102x: Silence TX timeout

As long as the MSE102x is not operational, every packet transmission
will run into a TX timeout and flood the kernel log. So log only the
first TX timeout and a user is at least informed about this issue.
The amount of timeouts are still available via netstat.

Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20240827191000.3244-3-wahrenst@gmx.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/vertexcom/mse102x.c

@@ -451,7 +451,7 @@ static void mse102x_tx_work(struct work_struct *work)
 
 	if (ret == -ETIMEDOUT) {
 		if (netif_msg_timer(mse))
-			netdev_err(mse->ndev, "tx work timeout\n");
+			netdev_err_once(mse->ndev, "tx work timeout\n");
 
 		mse->stats.tx_timeout++;
 	}