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

diff --git a/src/liblzma/common/memcmplen.h b/src/liblzma/common/memcmplen.h
index 5a481a02c9d897bc688427681c934e75c39c5663..5372cfa8f5eacc453a889683cc8c67e2fc94ba32 100644 (file)
--- 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))));