Unnecessary return declarations

[daopunk]

when a variable is declared in the return param, it is implied that it will be returned, so a return statement is not necessary:

  function getCircles(uint256[] calldata _ids) external view returns (Circle[] memory _circles) {
    _circles = new Circle[](_ids.length);
    for (uint256 i = 0; i < _ids.length; i++) {
      _circles[i] = circles[_ids[i]];
    }
    return _circles;
  }

can be:

  function getCircles(uint256[] calldata _ids) external view returns (Circle[] memory _circles) {
    _circles = new Circle[](_ids.length);
    for (uint256 i = 0; i < _ids.length; i++) {
      _circles[i] = circles[_ids[i]];
    }
  }