[epiphany] header-bar: Fix memory leak when changing homepage

[Michael Catanzaro <mcatanzaro src gnome org>]

commit c1ff13e2bb0024125f9add68901542ce32face50
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Sun Jan 29 21:57:59 2017 -0600

    header-bar: Fix memory leak when changing homepage
    
    https://bugzilla.gnome.org/show_bug.cgi?id=775641

 src/ephy-header-bar.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/ephy-header-bar.c b/src/ephy-header-bar.c
index b6c88c3..e7928d7 100644
--- a/src/ephy-header-bar.c
+++ b/src/ephy-header-bar.c
@@ -189,10 +189,11 @@ homepage_url_changed (GSettings  *settings,
                       const char *key,
                       GtkWidget  *button)
 {
-  const char *setting;
+  char *setting;
 
   setting = g_settings_get_string (settings, key);
   gtk_widget_set_visible (button, setting && setting[0]);
+  g_free (setting);
 }
 
 typedef enum {