git: ec58dba0ed80 - stable/15 - mkimg: Const correctness for C23

The branch stable/15 has been updated by ivy:

URL: https://cgit.FreeBSD.org/src/commit/?id=ec58dba0ed806875f7e9da5b1475b85db52421fd

commit ec58dba0ed806875f7e9da5b1475b85db52421fd
Author:     Lexi Winter <ivy@FreeBSD.org>
AuthorDate: 2026-08-03 14:08:13 +0000
Commit:     Lexi Winter <ivy@FreeBSD.org>
CommitDate: 2026-08-26 09:56:12 +0000

    mkimg: Const correctness for C23
    
    On some platforms, e.g. Linux Clang 22.1.8 / glibc 2.43, strchr()
    now implements the C23 behaviour where passing a const pointer to
    strchr() also returns a const pointer.  This breaks mkimg during
    the bootstrap build, since it assumes the return value is always
    a mutable pointer.
    
    Make the existing 'sep' pointer const to fix the first case, and
    for the second, introduce a new non-const pointer for strchr,
    since we do modify the result in that case.
    
    MFC after:      1 week
    Reviewed by:    markj
    Sponsored by:   The FreeBSD Foundation
    Differential Revision:  https://reviews.freebsd.org/D58493
    
    (cherry picked from commit 9fd8f5e761ba663c8e99eeff64c5a7fd7bcf1e05)
---
 usr.bin/mkimg/mkimg.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/usr.bin/mkimg/mkimg.c b/usr.bin/mkimg/mkimg.c
index c625b49dc29a..03dd76943393 100644
--- a/usr.bin/mkimg/mkimg.c
+++ b/usr.bin/mkimg/mkimg.c
@@ -248,7 +248,8 @@ static int
 parse_part(const char *spec)
 {
 	struct part *part;
-	char *sep;
+	const char *sep;
+	char *asep;
 	size_t len;
 	int error;
 
@@ -301,15 +302,14 @@ parse_part(const char *spec)
 		goto errout;
 	}
 
-	spec = part->alias;
-	sep = strchr(spec, '/');
-	if (sep != NULL) {
-		*sep++ = '\0';
-		if (strlen(part->alias) == 0 || strlen(sep) == 0) {
+	asep = strchr(part->alias, '/');
+	if (asep != NULL) {
+		*asep++ = '\0';
+		if (strlen(part->alias) == 0 || strlen(asep) == 0) {
 			error = EINVAL;
 			goto errout;
 		}
-		part->label = strdup(sep);
+		part->label = strdup(asep);
 		if (part->label == NULL) {
 			error = ENOMEM;
 			goto errout;