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ALSA: pcm: use "do {} while (0)" for empty macro 

Recent compilers produce a harmless warning for the new pcm_call_notify()
macro when CONFIG_SND_PCM_OSS is disabled:

sound/core/pcm.c: In function 'snd_pcm_free':
sound/core/pcm.c:905:37: error: suggest braces around empty body in an 'if' statement [-Werror=empty-body]

This turns the empty macro into a 'do {} while (0)' statement to avoid
the warning.

Fixes: 58f30d650c ("ALSA: pcm: Build pcm notifier code conditionally")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Arnd Bergmann 2017-05-18 15:35:54 +02:00 committed by Takashi Iwai
parent b46fe5d960
commit 9aee03f39c
1 changed files with 1 additions and 1 deletions
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2
sound/core/pcm.c
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@ -894,7 +894,7 @@ static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
_notify->call(pcm); \
} while (0)
#else
#define pcm_call_notify(pcm, call) /* NOP */
#define pcm_call_notify(pcm, call) do {} while (0)
#endif
static int snd_pcm_free(struct snd_pcm *pcm)