ALSA: nm256: More constifications

Apply const prefix to the static tables coefs and init registers.

Just for minor optimization and no functional changes.

Link: https://lore.kernel.org/r/20200105144823.29547-28-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/nm256/nm256.c

@@ -299,7 +299,7 @@ snd_nm256_writel(struct nm256 *chip, int offset, u32 val)
 }
 
 static inline void
-snd_nm256_write_buffer(struct nm256 *chip, void *src, int offset, int size)
+snd_nm256_write_buffer(struct nm256 *chip, const void *src, int offset, int size)
 {
 	offset -= chip->buffer_start;
 #ifdef CONFIG_SND_DEBUG
@@ -1179,7 +1179,7 @@ struct initialValues {
 	unsigned short value;
 };
 
-static struct initialValues nm256_ac97_init_val[] =
+static const struct initialValues nm256_ac97_init_val[] =
 {
 	{ AC97_MASTER, 		0x8000 },
 	{ AC97_HEADPHONE,	0x8000 },

sound/pci/nm256/nm256_coef.c

 // SPDX-License-Identifier: GPL-2.0
 #define NM_TOTAL_COEFF_COUNT 0x3158
 
-static char coefficients[NM_TOTAL_COEFF_COUNT * 4] = { 
+static const char coefficients[NM_TOTAL_COEFF_COUNT * 4] = {
 	0xFF, 0xFF, 0x2F, 0x00, 0x4B, 0xFF, 0xA5, 0x01, 0xEF, 0xFC, 0x21,
 	0x05, 0x87, 0xF7, 0x62, 0x11, 0xE9, 0x45, 0x5E, 0xF9, 0xB5, 0x01,
 	0xDE, 0xFF, 0xA4, 0xFF, 0x60, 0x00, 0xCA, 0xFF, 0x0D, 0x00, 0xFD,
@@ -4598,7 +4598,7 @@ static char coefficients[NM_TOTAL_COEFF_COUNT * 4] = {
 	0x01, 0x8D, 0xFF, 0x0F, 0x00 
 };
 
-static u16
+static const u16
 coefficient_sizes[8 * 2] = {
 	/* Playback */
 	0x00C0, 0x5000, 0x0060, 0x2800, 0x0040, 0x0060, 0x1400, 0x0000,