Comment release_buffer()

For local use only, it does not replace gss_release_buffer().
Remove GSS_SUPPLEMENTARY_INFO from the gss-sample.c

There's no need to pre-mask if we're just doing another mask (bit
check) afterwards.
Update text for GSS_SUPPLEMENTARY_INFO removal
Update comments in gss-sample.c

Remove a useless one, and make some others more concise.
Plug memory leak

Must release client_name in the acceptor.
It's unclear whether we need to do this before continuing on to the
next iteration of the loop, too, though.
Cast gss_delete_sec_context() to void

We are not checking its return value, though some applications
might want to do to so.
Sync with gss-sample.c at 0ac7c0e684
De-tabify the artwork (sample code)

It doesn't render well with tabs for indentation.
Leave tabs for same-line comment separation, though.
Make draft-kaduk-kitten-gss-loop-01