git: 2871b8a185b2 - stable/14 - bspatch: use C23 overflow checking math now that it is available

The branch stable/14 has been updated by emaste:

URL: https://cgit.FreeBSD.org/src/commit/?id=2871b8a185b2c5b8de2d9f27301a7e523672b242

commit 2871b8a185b2c5b8de2d9f27301a7e523672b242
Author:     Ed Maste <emaste@FreeBSD.org>
AuthorDate: 2023-09-05 16:35:31 +0000
Commit:     Ed Maste <emaste@FreeBSD.org>
CommitDate: 2023-09-25 13:45:06 +0000

    bspatch: use C23 overflow checking math now that it is available
    
    Reviewed by:    des
    Sponsored by:   The FreeBSD Foundation
    Differential Revision: https://reviews.freebsd.org/D41771
    
    (cherry picked from commit ee12faa062c04a49bf6fe4e6867bad8606e2413f)
---
 usr.bin/bsdiff/bspatch/bspatch.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/usr.bin/bsdiff/bspatch/bspatch.c b/usr.bin/bsdiff/bspatch/bspatch.c
index a596ab1837dd..d7fabddabbfe 100644
--- a/usr.bin/bsdiff/bspatch/bspatch.c
+++ b/usr.bin/bsdiff/bspatch/bspatch.c
@@ -36,6 +36,7 @@
 #include <fcntl.h>
 #include <libgen.h>
 #include <limits.h>
+#include <stdckdint.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -64,15 +65,8 @@ add_off_t(off_t a, off_t b)
 {
 	off_t result;
 
-#if __GNUC__ >= 5 || \
-    (defined(__has_builtin) && __has_builtin(__builtin_add_overflow))
-	if (__builtin_add_overflow(a, b, &result))
+	if (ckd_add(&result, a, b))
 		errx(1, "Corrupt patch");
-#else
-	if ((b > 0 && a > OFF_MAX - b) || (b < 0 && a < OFF_MIN - b))
-		errx(1, "Corrupt patch");
-	result = a + b;
-#endif
 	return result;
 }