1. Drop support for no minor. This variant doesn't exist anymore.

1. Drop support for no minor. This variant doesn't exist anymore.
2. Pull up the actual minor processing code into the switch that
parses it.
3. atoi is actually simpler than strtonum in this case, but check the
input beforehand so we don't get unexpected results.
4. Slightly more consistent style between various parse and check and
increment operations on salt.
ok deraadt