Sean Cross aba36e4abf aesio: use bufinfo rather than mp_str_bytes
In order to accept both `bytes` objects and `bytearray` objects, use a
`bufinfo` construct to retrieve the data rather than
`mp_obj_str_get_data()`.

Signed-off-by: Sean Cross <sean@xobs.io>
2020-05-15 10:16:00 +08:00
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