SDL_mixer: readsbk.c: constify a few things.

SDL Commits
1 
From a376716bda54f4dc9b87fc2c2077bff77bca7cc8 Mon Sep 17 00:00:00 2001
From: sezero <[EMAIL REDACTED]>
Date: Thu, 31 Jul 2025 05:56:10 +0300
Subject: [PATCH] readsbk.c: constify a few things.

---
 src/timidity/readsbk.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/src/timidity/readsbk.c b/src/timidity/readsbk.c
index 34f0c44f..4310176c 100644
--- a/src/timidity/readsbk.c
+++ b/src/timidity/readsbk.c
@@ -62,7 +62,7 @@ static int READSTR(char *str, SDL_IOStream *io)
 #define SKIPW(io)	SDL_SeekIO(io, 2, SDL_IO_SEEK_CUR);
 #define SKIPDW(io)	SDL_SeekIO(io, 4, SDL_IO_SEEK_CUR);
 
-static int getchunk(char *id);
+static int getchunk(const char *id);
 static void process_chunk(int id, int s, SFInfo *sf, SDL_IOStream *io);
 static void load_sample_names(int size, SFInfo *sf, SDL_IOStream *io);
 static void load_preset_header(int size, SFInfo *sf, SDL_IOStream *io);
@@ -95,19 +95,19 @@ enum {
  *----------------------------------------------------------------*/
 
 #if 0
-static void debugid(char *tag, char *p)
+static void debugid(const char *tag, const char *p)
 {
 	char buf[5]; SDL_strlcpy(buf, p, 5);
 	SDL_Log("[%s:%s]", tag, buf);
 }
 
-static void debugname(char *tag, char *p)
+static void debugname(const char *tag, const char *p)
 {
 	char buf[21]; SDL_strlcpy(buf, p, 21);
 	SDL_Log("[%s:%s]", tag, buf);
 }
 
-static void debugval(char *tag, int v)
+static void debugval(const char *tag, int v)
 {
 	SDL_Log("[%s:%d]", tag, v);
 }
@@ -168,10 +168,10 @@ void free_sbk(SFInfo *sf)
  * get id value
  *----------------------------------------------------------------*/
 
-static int getchunk(char *id)
+static int getchunk(const char *id)
 {
 	static struct idstring {
-		char *str;
+		const char *str;
 		int id;
 	} idlist[] = {
 		{"LIST", LIST_ID},