tools: terminate option list with a zero entry
tools: terminate option list with a zero entry

Because, well, that's what we're supposed to do. Unless you want to think
outside the (array) box, but that has never helped anyone, has it?

Signed-off-by: Peter Hutterer <b9c50af7afa7642f6f854434cda9ffe54ece8b85@who-t.net>

libratbag/libratbag,whot/libratbag,whot/libratbag,libratbag/libratbag,whot/libratbag,libratbag/libratbag