sound/soc/fsl/p1022_ds.c: add missing of_node_put

dma_channel_np has been accessed at this point, so decrease its reference
count before leaving the function.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
identifier x;
expression E1!=0,E2,E3,E4;
statement S;
iterator I;
@@

(
if (...) { ... when != of_node_put(x)
               when != x = E3
               when != E3 = x
*  return ...;
 }
... when != x = E2
    when != I(...,x,...) S
if (...) { ... when != x = E4
 of_node_put(x); ... return ...; }
)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/fsl/p1022_ds.c

@@ -297,8 +297,10 @@ static int get_dma_channel(struct device_node *ssi_np,
 	 * dai->platform name should already point to an allocated buffer.
 	 */
 	ret = of_address_to_resource(dma_channel_np, 0, &res);
-	if (ret)
+	if (ret) {
+		of_node_put(dma_channel_np);
 		return ret;
+	}
 	snprintf((char *)dai->platform_name, DAI_NAME_SIZE, "%llx.%s",
 		 (unsigned long long) res.start, dma_channel_np->name);