fix: removes unnecessary address(0) check

Author: 0xItadaki

src/contracts/L2Resolver.sol

@@ -80,7 +80,6 @@ contract L2Resolver is IL2Resolver {
    */
   function _getOwner(bytes32 _node) private view returns (address _owner) {
     _owner = ENS_REGISTRY.owner(_node);
-    if (_owner == address(0)) return address(0);
     if (_owner == address(NAME_WRAPPER)) {
       _owner = NAME_WRAPPER.ownerOf(uint256(_node));
     }