[babl] tools: babl-gen-test-pixels: add explicit return 0

[Jehan Pagès <jehanp src gnome org>]

commit 3ce0813b38015c193708d1f4c768f8e5a7125bea
Author: Roman Lebedev <lebedev ri gmail com>
Date:   Mon Aug 22 15:25:31 2016 +0300

    tools: babl-gen-test-pixels: add explicit return 0
    
    Gcc-4.9 warns:
    babl-gen-test-pixels.c: In function ‘main’:
    babl-gen-test-pixels.c:170:1: error: control reaches end of non-void function [-Werror=return-type]

 tools/babl-gen-test-pixels.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/tools/babl-gen-test-pixels.c b/tools/babl-gen-test-pixels.c
index 0231224..54c1b16 100644
--- a/tools/babl-gen-test-pixels.c
+++ b/tools/babl-gen-test-pixels.c
@@ -167,4 +167,6 @@ int main (int argc, char **argv)
   gen_path_pixels ();
   gen_model_pixels ();
   gen_type_pixels ();
-}
\ No newline at end of file
+
+  return 0;
+}