Explicit cast for visual warnings

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Co-authored-by: Nick Terrell <nickrterrell@gmail.com>
diff --git a/lib/compress/zstd_compress.c b/lib/compress/zstd_compress.c
index cfe784f..d5ba3f0 100644
--- a/lib/compress/zstd_compress.c
+++ b/lib/compress/zstd_compress.c
@@ -2590,7 +2590,7 @@
 static int ZSTD_isRLE(const BYTE* src, size_t length) {
     const BYTE* ip = src;
     const BYTE value = ip[0];
-    const size_t valueST = value * 0x0101010101010101ULL;
+    const size_t valueST = (size_t)((U64)value * 0x0101010101010101ULL);
     const size_t unrollSize = sizeof(size_t) * 4;
     const size_t unrollMask = unrollSize - 1;
     const size_t prefixLength = length & unrollMask;