function onLint( error, errs ) {
		if ( error ) {
			debug( 'Encountered an error when linting files. Error: %s', error.message );
			return done( error );
		}
		debug( 'Found %d lint errors.', errs.length );
		done( null, errs );
	}
Callback invoked after linting files.

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