[Libguestfs] fix new failures from latest-from-gnulib syntax-check

[Jim Meyering]

Richard W.M. Jones wrote:

> On Fri, Nov 20, 2009 at 12:22:19PM +0100, Jim Meyering wrote:
>> There's a new syntax check rule from gnulib.
>> It requires that you write e.g., exit (EXIT_SUCCESS), not exit (0).
>> And the same for 1/EXIT_FAILURE and any other constants.
>
> Was there ever a platform where 0/1 weren't used for success or
> failure?  IIRC OS-9 was one such platform, but that was an indication
> of fail in OS-9.
>
> Anyway, I will push these patches shortly, with the exception of this
> hunk:
>
>   @@ -10056,7 +10056,7 @@ public class Bindtests {
>            }
>            catch (Exception exn) {
>                System.err.println (exn);
>   -            System.exit (1);
>   +            System.exit (EXIT_FAILURE);

Good catch.
That one will require either an exemption for the entire
src/generator.ml file (I'd rather not, considering how many
C exit stmts it emits), or an improved regexp in maint.mk that
would exempt all /\.exit/ uses.  I'll look at doing that.

>        }
>    }
>
> Rich.
>
> PS. http://coccinelle.lip6.fr/ is great for these sorts of semantic
> transformations.

Yes, I've used coccinelle, too.  Very nice tool.