ALSA: es1938: 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>
diff --git a/sound/pci/es1938.c b/sound/pci/es1938.c
index a544cd5..069902a 100644
--- a/sound/pci/es1938.c
+++ b/sound/pci/es1938.c
@@ -436,7 +436,7 @@
 	outb(0, SLSB_REG(chip, RESET));
 }
 
-static struct snd_ratnum clocks[2] = {
+static const struct snd_ratnum clocks[2] = {
 	{
 		.num = 793800,
 		.den_min = 1,
@@ -451,7 +451,7 @@
 	}
 };
 
-static struct snd_pcm_hw_constraint_ratnums hw_constraints_clocks = {
+static const struct snd_pcm_hw_constraint_ratnums hw_constraints_clocks = {
 	.nrats = 2,
 	.rats = clocks,
 };