ALSA: pcm: Remove unused inline function snd_mask_sizeof

There is no caller in tree, so can remove it.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Link: https://lore.kernel.org/r/20200909135744.33464-1-yuehaibing@huawei.comSigned-off-by: Takashi Iwai <tiwai@suse.de>

include/sound/pcm_params.h

@@ -23,11 +23,6 @@ int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
 #define MASK_OFS(i)	((i) >> 5)
 #define MASK_BIT(i)	(1U << ((i) & 31))
 
-static inline size_t snd_mask_sizeof(void)
-{
-	return sizeof(struct snd_mask);
-}
-
 static inline void snd_mask_none(struct snd_mask *mask)
 {
 	memset(mask, 0, sizeof(*mask));