ALSA: sonicvibes: Constify hw_constraints

snd_pcm_hw_constraint_list(), *_ratnums() and *_ratdens() receive the
const pointers.  Constify the corresponding static objects for better
hardening.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/sonicvibes.c

@@ -248,13 +248,13 @@ static const struct pci_device_id snd_sonic_ids[] = {
 
 MODULE_DEVICE_TABLE(pci, snd_sonic_ids);
 
-static struct snd_ratden sonicvibes_adc_clock = {
+static const struct snd_ratden sonicvibes_adc_clock = {
 	.num_min = 4000 * 65536,
 	.num_max = 48000UL * 65536,
 	.num_step = 1,
 	.den = 65536,
 };
-static struct snd_pcm_hw_constraint_ratdens snd_sonicvibes_hw_constraints_adc_clock = {
+static const struct snd_pcm_hw_constraint_ratdens snd_sonicvibes_hw_constraints_adc_clock = {
 	.nrats = 1,
 	.rats = &sonicvibes_adc_clock,
 };