small type fix

Author: christkv

lib/mongodb/connection.js

@@ -198,7 +198,7 @@ var setupConnectionPool = function(self, poolSize, reconnect) {
  if(sizeOfMessage > result.length) {
  // Create a new buffer with the correct size
  var buffer = new Buffer(conObj.buffer.length + result.length);
- conObj.buffer.copy(buffer, 0, 0, buffer.length);
+ conObj.buffer.copy(buffer, 0, 0, conObj.buffer.length);
  result.copy(buffer, conObj.buffer.length, 0, result.length);
  conObj.buffer = buffer;
  // Adjust variables