[gthumb] fixed run-time warning when opening a file

[Paolo Bacchilega <paobac src gnome org>]

commit 445834153d976f438ec20785bc1b1e7fa96bada0
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Sun Feb 19 16:00:49 2017 +0100

    fixed run-time warning when opening a file

 gthumb/gth-browser.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gthumb/gth-browser.c b/gthumb/gth-browser.c
index 91a6185..5d24bb3 100644
--- a/gthumb/gth-browser.c
+++ b/gthumb/gth-browser.c
@@ -5324,8 +5324,8 @@ _gth_browser_setup_header_bar_button (GthBrowser                  *browser,
                                                        action_name,
                                                        accelerator,
                                                        NULL);
-       gtk_widget_show (button);
        gtk_box_pack_start (GTK_BOX (gth_browser_get_headerbar_section (browser, section)), button, FALSE, 
FALSE, 0);
+       gtk_widget_show (button);
 }