function done( error, errs ) {
		if ( error ) {
			return clbk( error );
		}
		debug( 'Finished linting.' );
		clbk( null, errs );
	}
Callback invoked upon completion.

@private
@param {(Error|null)} error - error object
@param {(EmptyArray|ObjectArray)} errs - lint errors
@returns {void}