soc/stm/stm32_sub_sai: Add missing '\n' in log messages

Message logged by 'dev_xxx()' or 'pr_xxx()' should end with a '\n'.

Fixes: 3e086edf("ASoC: stm32: add SAI drivers")
Signed-off-by: Sebastian Fricke <sebastian.fricke.linux@gmail.com>
Link: https://lore.kernel.org/r/20200413042952.7675-1-sebastian.fricke.linux@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/stm/stm32_sai_sub.c

@@ -837,7 +837,7 @@ static int stm32_sai_set_config(struct snd_soc_dai *cpu_dai,
 		cr1 = SAI_XCR1_DS_SET(SAI_DATASIZE_32);
 		break;
 	default:
-		dev_err(cpu_dai->dev, "Data format not supported");
+		dev_err(cpu_dai->dev, "Data format not supported\n");
 		return -EINVAL;
 	}