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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def _read_regpol_file(reg_pol_path):
    '''
    helper function to read a reg policy file and return decoded data
    '''
    returndata = None
    if os.path.exists(reg_pol_path):
        with salt.utils.files.fopen(reg_pol_path, 'rb') as pol_file:
            returndata = pol_file.read()
    return returndata