ASoC: fsl_asrc: Use np variable

The 'np' variable is already assigned to 'pdev->dev.of_node', so use
it to improve readability.

No functional change.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/fsl/fsl_asrc.c

@@ -879,7 +879,7 @@ static int fsl_asrc_probe(struct platform_device *pdev)
 		}
 	}
 
-	if (of_device_is_compatible(pdev->dev.of_node, "fsl,imx35-asrc")) {
+	if (of_device_is_compatible(np, "fsl,imx35-asrc")) {
 		asrc_priv->channel_bits = 3;
 		clk_map[IN] = input_clk_map_imx35;
 		clk_map[OUT] = output_clk_map_imx35;