[gtk+] InfoBar: Fix wrong/uninit var use in code example

[Daniel Boles <dboles src gnome org>]

commit a2768144f19abf9f2e717264d299f2eae7112b3b
Author: Daniel Boles <dboles src gnome org>
Date:   Sat Aug 12 21:07:22 2017 +0100

    InfoBar: Fix wrong/uninit var use in code example
    
    https://bugzilla.gnome.org/show_bug.cgi?id=786144

 gtk/gtkinfobar.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkinfobar.c b/gtk/gtkinfobar.c
index 6fb798a..0ca11d9 100644
--- a/gtk/gtkinfobar.c
+++ b/gtk/gtkinfobar.c
@@ -81,7 +81,7 @@
  * GtkInfoBar *bar;
  *
  * widget = gtk_info_bar_new ();
- * bar = GTK_INFO_BAR (bar);
+ * bar = GTK_INFO_BAR (widget);
  *
  * message_label = gtk_label_new ("");
  * gtk_widget_show (message_label);