src/ccze-color.c: Use a static stat buffer

Use a static struct stat buffer when loading a color file, so we have a
clean starting state.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
src/ccze.c: Minor exit-time leak plugs

Free up a few more things at exit-time to make valgrind 100% happy.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>