def nla_data(nla):
return bytearray_ptr(nla.bytearray, NLA_HDRLEN)<EOL>
Return bytearray_ptr of the payload data.

    https://github.com/thom311/libnl/blob/libnl3_2_25/lib/attr.c#L120

    Positional arguments:
    nla -- attribute (nlattr class instance).

    Returns:
    Bytearray payload data.