net: ethernet: renesas: rswitch: Fix error path in renesas_eth_sw_probe()

If rswitch_init() returns non-zero and this driver is re-probed,
the following error happens:

    renesas_eth_sw e6880000.ethernet: Unbalanced pm_runtime_enable!

So, fix error path in renesas_eth_sw_probe().

Fixes: 3590918b ("net: ethernet: renesas: Add support for "Ethernet Switch"")
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/renesas/rswitch.c

@@ -1786,6 +1786,11 @@ static int renesas_eth_sw_probe(struct platform_device *pdev)
 	pm_runtime_get_sync(&pdev->dev);
 
 	ret = rswitch_init(priv);
+	if (ret < 0) {
+		pm_runtime_put(&pdev->dev);
+		pm_runtime_disable(&pdev->dev);
+		return ret;
+	}
 
 	device_set_wakeup_capable(&pdev->dev, 1);