Investigate binary creation warning

[mkuratczyk]

When compiling with bin_opt_info, we have one warning currently:

$ ERL_COMPILER_OPTIONS=bin_opt_info make
...
src/osiris_log.erl:623: BINARY CREATED: binary is used in term passed to part/2
%  623|     validate_crc(Next, Crc, part(DataSize, DataAndTrailer)),
...