[vala] gen-introspect: Fix exit code for missing header files

[Jürg Billeter <juergbi src gnome org>]

commit 0c607cd70fd5e3066cc65a3e472adcf6d8fb0698
Author: Jürg Billeter <j bitron ch>
Date:   Wed Dec 22 09:33:15 2010 +0100

    gen-introspect: Fix exit code for missing header files
    
    Fixes bug 633596.

 gobject-introspection/scanner.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gobject-introspection/scanner.c b/gobject-introspection/scanner.c
index d98af49..dcaa01c 100644
--- a/gobject-introspection/scanner.c
+++ b/gobject-introspection/scanner.c
@@ -1753,7 +1753,7 @@ main (int argc, char **argv)
     {
       g_printerr ("ERROR: Need at least one header file.\n");
       g_igenerator_free (igenerator);  
-      return 0;
+      return 1;
     }
   igenerator->filenames = filenames;
   cpp_options = g_list_reverse (cpp_options);