ASoC: use of_property_read_bool

Use of_property_read_bool to check for the existence of a property.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression e1,e2;
statement S2,S1;
@@
-       if (of_get_property(e1,e2,NULL))
+       if (of_property_read_bool(e1,e2))
        S1 else S2
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sh/rcar/ssi.c

@@ -928,7 +928,7 @@ int rsnd_ssi_probe(struct rsnd_priv *priv)
 		}
 
 		ops = &rsnd_ssi_non_ops;
-		if (of_get_property(np, "pio-transfer", NULL))
+		if (of_property_read_bool(np, "pio-transfer"))
 			ops = &rsnd_ssi_pio_ops;
 		else
 			ops = &rsnd_ssi_dma_ops;