fixed initialization issue in bench

lib/compress/zstd_compress.c

@@ -2148,7 +2148,7 @@ static size_t ZSTD_writeFrameHeader(void* dst, size_t dstCapacity,
                                     ZSTD_parameters params, U64 pledgedSrcSize, U32 dictID)
 {   BYTE* const op = (BYTE*)dst;
     U32 const dictIDSizeCode = (dictID>0) + (dictID>=256) + (dictID>=65536);   /* 0-3 */
-    U32 const checksumFlag = params.fParams.checksumFlag;
+    U32 const checksumFlag = params.fParams.checksumFlag>0;
     U32 const windowSize = 1U << params.cParams.windowLog;
     U32 const directModeFlag = params.fParams.contentSizeFlag && (windowSize > (pledgedSrcSize-1));
     BYTE const windowLogByte = (BYTE)((params.cParams.windowLog - ZSTD_WINDOWLOG_ABSOLUTEMIN) << 3);