Raise WARNS to 6:

Raise WARNS to 6:
- Constify several char *'s.
- Mark unused parameters as __unused.
- Rename local variables.
- Format function prototypes and remove parameter names.
- Expand a macro that was only used twice (on the same
  parameter) into a real variable to eliminate signed
  versus unsigned comparison warning [1].

Submitted-by: Larry Lansing <lansil_at_fuzzynerd_dot_com>
Additional-work-by: cpressey [1]