ALSA: sb: Fix PCM format bit calculation

The PCM format type in snd_pcm_format_t can't be treated as integer
implicitly since it's with __bitwise.  We have already a helper
function to get the bit index of the given type, and use it in each
place instead.

This fixes sparse warnings like:
  sound/isa/sb/sb16_main.c:61:44: warning: restricted snd_pcm_format_t degrades to integer
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/isa/sb/sb16_main.c

@@ -49,6 +49,9 @@ MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
 MODULE_DESCRIPTION("Routines for control of 16-bit SoundBlaster cards and clones");
 MODULE_LICENSE("GPL");
 
+#define runtime_format_bits(runtime) \
+	((unsigned int)pcm_format_to_bits((runtime)->format))
+
 #ifdef CONFIG_SND_SB16_CSP
 static void snd_sb16_csp_playback_prepare(struct snd_sb *chip, struct snd_pcm_runtime *runtime)
 {
@@ -58,7 +61,7 @@ static void snd_sb16_csp_playback_prepare(struct snd_sb *chip, struct snd_pcm_ru
 		if (csp->running & SNDRV_SB_CSP_ST_LOADED) {
 			/* manually loaded codec */
 			if ((csp->mode & SNDRV_SB_CSP_MODE_DSP_WRITE) &&
-			    ((1U << runtime->format) == csp->acc_format)) {
+			    (runtime_format_bits(runtime) == csp->acc_format)) {
 				/* Supported runtime PCM format for playback */
 				if (csp->ops.csp_use(csp) == 0) {
 					/* If CSP was successfully acquired */
@@ -66,7 +69,7 @@ static void snd_sb16_csp_playback_prepare(struct snd_sb *chip, struct snd_pcm_ru
 				}
 			} else if ((csp->mode & SNDRV_SB_CSP_MODE_QSOUND) && (csp->q_enabled)) {
 				/* QSound decoder is loaded and enabled */
-				if ((1 << runtime->format) & (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U8 |
+				if (runtime_format_bits(runtime) & (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U8 |
 							      SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_U16_LE)) {
 					/* Only for simple PCM formats */
 					if (csp->ops.csp_use(csp) == 0) {
@@ -106,7 +109,7 @@ static void snd_sb16_csp_capture_prepare(struct snd_sb *chip, struct snd_pcm_run
 		if (csp->running & SNDRV_SB_CSP_ST_LOADED) {
 			/* manually loaded codec */
 			if ((csp->mode & SNDRV_SB_CSP_MODE_DSP_READ) &&
-			    ((1U << runtime->format) == csp->acc_format)) {
+			    (runtime_format_bits(runtime) == csp->acc_format)) {
 				/* Supported runtime PCM format for capture */
 				if (csp->ops.csp_use(csp) == 0) {
 					/* If CSP was successfully acquired */