ALSA: msnd: constify pnp_card_device_id

pnp_card_device_id are not supposed to change at runtime. All functions
working with pnp_card_device_id provided by <linux/pnp.h> work with
const pnp_card_device_id. So mark the non-const structs as const.
Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/isa/msnd/msnd_pinnacle.c

@@ -1192,7 +1192,7 @@ static void snd_msnd_pnp_remove(struct pnp_card_link *pcard)
 static int isa_registered;
 static int pnp_registered;
 
-static struct pnp_card_device_id msnd_pnpids[] = {
+static const struct pnp_card_device_id msnd_pnpids[] = {
 	/* Pinnacle PnP */
 	{ .id = "BVJ0440", .devs = { { "TBS0000" }, { "TBS0001" } } },
 	{ .id = "" }	/* end */