[nautilus] special-location-bar: fix missing casting

[Carlos Soriano Sánchez <csoriano src gnome org>]

commit 94fbfb5ce2959790ff53060c70ee443b9373d6a8
Author: Carlos Soriano <csoriano gnome org>
Date:   Mon Apr 18 10:15:02 2016 +0200

    special-location-bar: fix missing casting
    
    Having so many deprecation warnings obscure the real warnings... :/
    Should run more frequently with those disabled.

 src/nautilus-special-location-bar.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/nautilus-special-location-bar.c b/src/nautilus-special-location-bar.c
index 73bb5d6..001712b 100644
--- a/src/nautilus-special-location-bar.c
+++ b/src/nautilus-special-location-bar.c
@@ -66,7 +66,8 @@ set_special_location (NautilusSpecialLocationBar *bar,
        gtk_widget_show (bar->priv->label);
 
         if (learn_more_markup) {
-                gtk_label_set_markup (bar->priv->learn_more_label, learn_more_markup);
+                gtk_label_set_markup (GTK_LABEL (bar->priv->learn_more_label),
+                                      learn_more_markup);
                 gtk_widget_show (bar->priv->learn_more_label);
                 g_free (learn_more_markup);
         } else {