ASoC: simple-card-utils: add __printf attribute

asoc_simple_card_set_dailink_name() uses devm_kvasprintf() to format
some of its arguments.  Adding a __printf attribute to this function
makes it possible to detect at compile-time errors related to format
strings.
Signed-off-by: Nicolas Iooss <nicolas.iooss_linux@m4x.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

include/sound/simple_card_utils.h

@@ -27,6 +27,7 @@ int asoc_simple_card_parse_daifmt(struct device *dev,
 				  struct device_node *codec,
 				  char *prefix,
 				  unsigned int *retfmt);
+__printf(3, 4)
 int asoc_simple_card_set_dailink_name(struct device *dev,
 				      struct snd_soc_dai_link *dai_link,
 				      const char *fmt, ...);