git: b4d8d9bde083 - stable/15 - rallocx path: only set errno on the realloc case.

The branch stable/15 has been updated by brooks:

URL: https://cgit.FreeBSD.org/src/commit/?id=b4d8d9bde083b466bc0728c6400cf5e6439f44e3

commit b4d8d9bde083b466bc0728c6400cf5e6439f44e3
Author:     Qi Wang <interwq@gwu.edu>
AuthorDate: 2026-03-03 11:55:23 +0000
Commit:     Brooks Davis <brooks@FreeBSD.org>
CommitDate: 2026-03-13 09:13:16 +0000

    rallocx path: only set errno on the realloc case.
    
    PR:             291677
    Obtained from:  jemalloc (commit 83b075789b4239035931c1ee212576d00153bbf0)
    Fixes:          c43cad871720 ("jemalloc: Merge from jemalloc 5.3.0 vendor branch")
    MFC after:      3 days
    Pull Request:   https://github.com/freebsd/freebsd-src/pull/2059
    
    (cherry picked from commit 2c5cd07828ad76c332e3bedc29fc641809e85396)
---
 contrib/jemalloc/src/jemalloc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/contrib/jemalloc/src/jemalloc.c b/contrib/jemalloc/src/jemalloc.c
index 352c18870e0b..edf23b9801b4 100644
--- a/contrib/jemalloc/src/jemalloc.c
+++ b/contrib/jemalloc/src/jemalloc.c
@@ -3561,7 +3561,9 @@ do_rallocx(void *ptr, size_t size, int flags, bool is_realloc) {
 
 	return p;
 label_oom:
-	set_errno(ENOMEM);
+	if (is_realloc) {
+		set_errno(ENOMEM);
+	}
 	if (config_xmalloc && unlikely(opt_xmalloc)) {
 		malloc_write("<jemalloc>: Error in rallocx(): out of memory\n");
 		abort();