ASoC: Change return type of snd_soc_write() to int

The CODEC's write callback can return a negative error code, make sure to pass
that on correctly.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/include/sound/soc.h b/include/sound/soc.h
index 81bc331..192ddc4 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -1125,8 +1125,8 @@
 
 /* codec IO */
 unsigned int snd_soc_read(struct snd_soc_codec *codec, unsigned int reg);
-unsigned int snd_soc_write(struct snd_soc_codec *codec,
-			   unsigned int reg, unsigned int val);
+int snd_soc_write(struct snd_soc_codec *codec, unsigned int reg,
+	unsigned int val);
 
 /* device driver data */