bt_pbp_parse_announcement was defined as uint8_t return value function,
but returned errno values, so it was modified to return an int instead.
The return values are also now more granular and documented.
The function also triggered a coverity issue with the way that it
parsed the data->data, as it would be marked as tainted. This should
be fixed by using the net_buf_simple API, which also improves on
some other parts of the code.
Finally the meta argument for the function was changed from an
unknown sized buffer, where the caller somehow had to know the
size of the metadata before calling the parsing function, to
an output pointer. This also omits the requirement for the
caller to always copy the metadata, where now it just
gets a pointer to the metadata in the bt_data struct. The application
can now always decide whether to continue to parse the metadata or
to copy it, using the pointer and the return value of the function.
Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
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