Return restartcheck result and append errors (if any) to ``errors``

def _get_restartcheck_result(errors):
    '''
    Return restartcheck result and append errors (if any) to ``errors``
    '''
    rs_result = __salt__['restartcheck.restartcheck'](verbose=False)
    if isinstance(rs_result, dict) and 'comment' in rs_result:
        errors.append(rs_result['comment'])
    return rs_result