* libr/bin: no need to allocate RBinOptions on the heap
* bin: start using r_return_* around, that's just the beginning
* bin: remove io_owned since it's not used anywhere
* io: make r_io_bind return nothing
* bin: remove unused functions and simplify r_bin_load_io
r_bin_load_io was calling r_bin_load_io2 with UT64_MAX as sz parameter,
but r_bin_load_io2 just returns false if (st64)sz is less than 0, so
that call is actually useless and can be removed.
* bin/bin: fix some preconditions
* bin/open: fix precondition to check for bin and filename too
64d16fc506