RE: [PATCH] builtins + test helpers: use return instead of exit() in cmd_*

> Change various cmd_* functions to use "return" instead of exit() to
> indicate an exit code. On Solaris with SunCC the compiler legitimately
> complains about these, since we'll e.g. skip the cleanup (e.g. closing
> fd's, erroring if we can't) in git.c's run_builtin() when we exit()
> directly like this.
> 
> Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>