Fix RequestBlockEntityPacketListener writing

src/main/java/com/moulberry/axiom/packet/RequestBlockEntityPacketListener.java

@@ -54,7 +54,7 @@ public class RequestBlockEntityPacketListener implements AxiomPacketListener {
         // Send response packet
         ByteBuf out = MojBuf.unpooled();
         out.writeLong(id);
-        MojBuf.writeVarInt(buf, map.size());
+        MojBuf.writeVarInt(out, map.size());
         for (Long2ObjectMap.Entry<CompressedBlockEntity> entry : map.long2ObjectEntrySet()) {
             out.writeLong(entry.getLongKey());
             entry.getValue().write(out);