ALII-4689 - Only close lwip socket (lwip_close) and free CYASSL object (...

...CyaSSL_free) once.

@raensink @karlj-spindance - Please review.

Signed-off-by: Mike Stitt <mikes@spindance.com>
Well they can't use the objects after we close them and free them lwip and cyassl don't think they exist, so to use them would be to crash the program.  Regardless of us nulling/zeroing them.