[PATCH] xalloc-oversized: pacify gcc -Wuseless-cast

* lib/xalloc-oversized.h (xalloc_oversized): 1 → 1u.
---
 ChangeLog              | 3 +++
 lib/xalloc-oversized.h | 6 ++++--
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index ea72f7062e..33a67ff322 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
 2026-05-25  Paul Eggert  <[email protected]>
 
+	xalloc-oversized: pacify gcc -Wuseless-cast
+	* lib/xalloc-oversized.h (xalloc_oversized): 1 → 1u.
+
 	quotearg: be nicer on macOS etc
 	Problem reported by Bruno Haible in:
 	https://lists.gnu.org/r/bug-gnulib/2026-05/msg00150.html
diff --git a/lib/xalloc-oversized.h b/lib/xalloc-oversized.h
index cecdaec51e..96c5f16570 100644
--- a/lib/xalloc-oversized.h
+++ b/lib/xalloc-oversized.h
@@ -43,10 +43,12 @@
    : malloc (N * (size_t) S)).
 
    This is a macro, not a function, so that it works even if an
-   argument exceeds MAX (PTRDIFF_MAX, SIZE_MAX).  */
+   argument exceeds MAX (PTRDIFF_MAX, SIZE_MAX).  The 1u pacifies
+   -Wuseless-cast, and unlike a compound literal can appear in an
+   integer constant expression.  */
 #if 7 <= __GNUC__ && !defined __clang__ && PTRDIFF_MAX < SIZE_MAX
 # define xalloc_oversized(n, s) \
-   __builtin_mul_overflow_p (n, s, (ptrdiff_t) 1)
+   __builtin_mul_overflow_p (n, s, (ptrdiff_t) 1u)
 #elif 5 <= __GNUC__ && !defined __clang__ && !defined __ICC \
       && PTRDIFF_MAX < SIZE_MAX
 # define xalloc_oversized(n, s) \
-- 
2.54.0