Progress: Do some structural clean ups.

Progress: Do some structural clean ups.

The `f_fss_seek_to_eol()` returns `F_okay_eol`.
Check that instead of doing a buffer string character comparison where possible.

Improve some condition block logic regarding breaks, returns, and continues.

Change some of the status error checking to reduce return statements.
I have probably flip flopped on this problem numerous times.
Looking into how compilers and CPUs like to optimize things, I believe that reducing the return statements will be of benefit vs the probably cleaner immediate returns.
This can only be done when it is clear and when the status code being returned (or any state) is identical between calls.