[ALSA] ASoC - Fix build warnings in soc-core.c
This patch fixes some build warnings in soc-core.c Changes:- o Check the return value of soc_ac97_dev_register() o Check return value of calls to device_create_file() Signed-off-by: NLiam Girdwood <liam.girdwood@wolfsonmicro.com> Signed-off-by: NTakashi Iwai <tiwai@suse.de> Signed-off-by: NJaroslav Kysela <perex@suse.cz>
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