Remove redundant code

emsdk/patches/lz4_c.patch

@@ -44,25 +44,15 @@ index 4c3f583b7..5291002a4 100644
      },
      createNode: function (parent, name, mode, dev, contents, mtime) {
        var node = FS.createNode(parent, name, mode);
-@@ -112,8 +106,17 @@ mergeInto(LibraryManager.library, {
+@@ -112,6 +106,7 @@ mergeInto(LibraryManager.library, {
          //console.log('LZ4 read ' + [offset, length, position]);
          length = Math.min(length, stream.node.size - position);
          if (length <= 0) return 0;
 +
          var contents = stream.node.contents;
          var compressedData = contents.compressedData;
-+        if (compressedData.buf === null) {
-+          compressedData.buf = Module['_malloc'](LZ4.CHUNK_SIZE);
-+          for (var i = 0; i < compressedData.cachedIndexes.length; i++) {
-+            compressedData.cachedIndexes[i] = -1;
-+            compressedData.cachedChunks[i] = Module['_malloc'](LZ4.CHUNK_SIZE);
-+            assert(compressedData.cachedChunks[i] !== null)
-+          }
-+        }
          var written = 0;
-         while (written < length) {
-           var start = contents.start + position + written; // start index in uncompressed data
-@@ -122,6 +125,8 @@ mergeInto(LibraryManager.library, {
+@@ -122,6 +117,8 @@ mergeInto(LibraryManager.library, {
            var chunkIndex = Math.floor(start / LZ4.CHUNK_SIZE);
            var compressedStart = compressedData.offsets[chunkIndex];
            var compressedSize = compressedData.sizes[chunkIndex];
@@ -71,7 +61,7 @@ index 4c3f583b7..5291002a4 100644
            var currChunk;
            if (compressedData.successes[chunkIndex]) {
              var found = compressedData.cachedIndexes.indexOf(chunkIndex);
-@@ -138,18 +143,19 @@ mergeInto(LibraryManager.library, {
+@@ -138,18 +135,19 @@ mergeInto(LibraryManager.library, {
                  Module['decompressedChunks'] = (Module['decompressedChunks'] || 0) + 1;
                }
                var compressed = compressedData.data.subarray(compressedStart, compressedStart + compressedSize);
@@ -99,7 +89,7 @@ index 4c3f583b7..5291002a4 100644
            var currWritten = endInChunk - startInChunk;
            written += currWritten;
          }
-@@ -181,4 +187,3 @@ if (LibraryManager.library['$FS__deps']) {
+@@ -181,4 +179,3 @@ if (LibraryManager.library['$FS__deps']) {
    warn('FS does not seem to be in use (no preloaded files etc.), LZ4 will not do anything');
  }
  #endif