ASoC: samsung: fix spelling mistake: "unknwon" -> "unknown"

trivial fix to spelling mistake in pr_err message
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/samsung/s3c-i2s-v2.c

@@ -268,7 +268,7 @@ static int s3c2412_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
 		iismod &= ~S3C2412_IISMOD_SLAVE;
 		break;
 	default:
-		pr_err("unknwon master/slave format\n");
+		pr_err("unknown master/slave format\n");
 		return -EINVAL;
 	}