alsa: fix snd_BUG_on() and friends

sound/pci/pcxhr/pcxhr_core.c: In function 'pcxhr_set_pipe_cmd_params':
sound/pci/pcxhr/pcxhr_core.c:700: warning: statement with no effect
sound/pci/pcxhr/pcxhr_core.c:706: warning: statement with no effect
sound/pci/pcxhr/pcxhr_core.c:710: warning: statement with no effect

Due to

try to fix this, and be more conventional about the empty stubs.

Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Takashi Iwai <[e-mail]>

include/sound/core.h

···
 
 #else /* !CONFIG_SND_DEBUG */
 
-#define snd_printd(fmt, args...)	/* nothing */
-#define snd_BUG()			/* nothing */
-#define snd_BUG_ON(cond)	({/*(void)(cond);*/ 0;})  /* always false */
+#define snd_printd(fmt, args...)	do { } while (0)
+#define snd_BUG()			do { } while (0)
+static inline int __snd_bug_on(void)
+{
+	return 0;
+}
+#define snd_BUG_ON(cond)		__snd_bug_on()  /* always false */
 
 #endif /* CONFIG_SND_DEBUG */