Whitespace + coding style cleanup

- Use Emacs K&R style
- Add missing braces to for() loops
- Fix coding style issues in cli.c example
- Add empty lines to separate sections
- Simplify and de-indent code, check error case first + continue

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

src/sysos9.c

@@ -57,8 +57,7 @@ void rl_add_slash(char *path, char *p)
 
 /**
  * Local Variables:
- *  indent-tabs-mode: t
- *  c-file-style: "ellemtel"
+ *  c-file-style: "k&r"
  *  c-basic-offset: 4
  * End:
  */