ASoC: kirkwood: fix loss of external clock at probe time

At probe time, when the clock driver is not yet initialized, the external clock of the kirkwood sound device will not be usable.

This patch fixes this problem defering the device probe.

---
 sound/soc/kirkwood/kirkwood-i2s.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

index 0f3d73d..14f32d9 100644
@@ -496,7 +496,10 @@ static int kirkwood_i2s_dev_probe(struct platform_device *pdev)
 		return err;
 
 	priv->extclk = devm_clk_get(&pdev->dev, "extclk");
-	if (!IS_ERR(priv->extclk)) {
+	if (IS_ERR(priv->extclk)) {
+		if (PTR_ERR(priv->extclk) == -EPROBE_DEFER)
+			return -EPROBE_DEFER;
+	} else {
 		if (priv->extclk == priv->clk) {
 			devm_clk_put(&pdev->dev, priv->extclk);
 			priv->extclk = ERR_PTR(-EINVAL);

Ken ar c'hentañ	|	      ** Breizh ha Linux atav! **
Jef		|		http://moinejf.free.fr/
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Applied, thanks. It won't do anything without a version of patch 1 but
there's no build time dependency and it seems like we should get a fix
into the core for the unspecified vs unregistered problem.
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