https://github.com/tukaani-project/xz/commit/0673c9ec98b6bae12b33dc295564514aaa26e2fc

From 0673c9ec98b6bae12b33dc295564514aaa26e2fc Mon Sep 17 00:00:00 2001
From: Lasse Collin <lasse.collin@tukaani.org>
Date: Sun, 19 Mar 2023 22:45:59 +0200
Subject: [PATCH] liblzma: Silence -Wsign-conversion in SSE2 code in
 memcmplen.h.

Thanks to Christian Hesse for reporting the issue.
Fixes: https://github.com/tukaani-project/xz/issues/44
--- a/src/liblzma/common/memcmplen.h
+++ b/src/liblzma/common/memcmplen.h
@@ -89,7 +89,8 @@ lzma_memcmplen(const uint8_t *buf1, const uint8_t *buf2,
 	// version isn't used on x86-64.
 #	define LZMA_MEMCMPLEN_EXTRA 16
 	while (len < limit) {
-		const uint32_t x = 0xFFFF ^ _mm_movemask_epi8(_mm_cmpeq_epi8(
+		const uint32_t x = 0xFFFF ^ (uint32_t)_mm_movemask_epi8(
+			_mm_cmpeq_epi8(
 			_mm_loadu_si128((const __m128i *)(buf1 + len)),
 			_mm_loadu_si128((const __m128i *)(buf2 + len))));