ASoC: fsl: fix spelling mistake: "missign" -> "missing"

There is a spelling mistake in a dev_err message. Fix this.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
Acked-by: Viorel Suman <viorel.suman@nxp.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/fsl/imx-audmix.c

@@ -161,7 +161,7 @@ static int imx_audmix_probe(struct platform_device *pdev)
 	}
 
 	if (!audmix_np) {
-		dev_err(&pdev->dev, "Missign DT node for parent device.\n");
+		dev_err(&pdev->dev, "Missing DT node for parent device.\n");
 		return -EINVAL;
 	}