ASoC: kirkwood: Free external clock if it is a duplicate of internal

[Remaining patch from "ASoC: kirkwood: use devm_clk_get() for the
external clock" -- broonie]
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: NMark Brown <broonie@linaro.org>

sound/soc/kirkwood/kirkwood-i2s.c

@@ -495,6 +495,7 @@ static int kirkwood_i2s_dev_probe(struct platform_device *pdev)
 	priv->extclk = devm_clk_get(&pdev->dev, "extclk");
 	if (!IS_ERR(priv->extclk)) {
 		if (priv->extclk == priv->clk) {
+			devm_clk_put(&pdev->dev, priv->extclk);
 			priv->extclk = ERR_PTR(-EINVAL);
 		} else {
 			dev_info(&pdev->dev, "found external clock\n");