CLEANUP: ssl/cli: do not loop on unknown states in "add ssl crt-list" handler

CLEANUP: ssl/cli: do not loop on unknown states in "add ssl crt-list" handler

The io_handler in "add ssl crt_list" is built around a "while" loop that
only makes forward progress and that doesn't handle its final state as
it's not supposed to be called again once reached. This makes the code
confusing because its construct implies an infinite loop for such a
state (or any other unhandled one). Let's just remove that unneeded loop.