[gnome-devel-docs] Make error message more explicit when printed to the user

[Luis Menina <lmenina src gnome org>]

commit 60566db99f0aad4e6bc6ce39396c1e79701c1979
Author: Luis Menina <liberforce freeside fr>
Date:   Tue Dec 17 02:38:36 2013 +0100

    Make error message more explicit when printed to the user

 platform-demos/C/samples/menubar.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/platform-demos/C/samples/menubar.c b/platform-demos/C/samples/menubar.c
index ff2f4a9..dd1722e 100644
--- a/platform-demos/C/samples/menubar.c
+++ b/platform-demos/C/samples/menubar.c
@@ -276,12 +276,12 @@ startup (GApplication *app,
   builder = gtk_builder_new ();
   /* Get the file (if it is there):
    * Note: you must make sure that the file is in the current directory for
-   * this to work. The function used here returns a value within our variable
-   * "error", and it is equal to zero if an error is indeed found.
+   * this to work. The function used here returns a non-null value within
+   * our variable "error" if an error is indeed found.
    */
   gtk_builder_add_from_file (builder, "menubar.ui", &error);
   if (error != NULL) {
-     g_print ("File not found.\n");
+     g_print ("%s\n", error->message);
      g_error_free (error);
   }