chafa: Return TRUE (0) after print_version().

[cdluminate]

I need a dry-run chafa command for Debian's autopkgtest infrastructure, which continuously checks whether a package is malfunctional. However currently chafa --help and chafa --version both return FALSE (1) such that autopkgtest would consider it as an error. This is a false-positive.

Taking gcc as an example

$ gcc ; echo $?
gcc: fatal error: no input files
compilation terminated.
1
$ gcc --version ; echo $?
gcc (Debian 8.1.0-9) 8.1.0
Copyright (C) 2018 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

0
$ gcc --help >/dev/null ; echo $?
0
$ 

We can see that gcc --version doesn't return a failure.

Similar to gcc, this patch makes chafa --version return 0.

[hpjansson]

Thanks, this is obviously correct. I'll fix the help case too in a separate commit.