[gtk+] label: Also initialize text

[Timm Bäder <baedert src gnome org>]

commit df38db70a098c9c064602c732317576a222a11de
Author: Timm Bäder <mail baedert org>
Date:   Thu May 5 11:21:56 2016 +0200

    label: Also initialize text
    
    So gtk_label_get_text returns the default value of "". Broke the
    GtkModelButton default value test.

 gtk/gtklabel.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtklabel.c b/gtk/gtklabel.c
index c3d5db7..148faa9 100644
--- a/gtk/gtklabel.c
+++ b/gtk/gtklabel.c
@@ -1383,7 +1383,7 @@ gtk_label_init (GtkLabel *label)
 
   priv->mnemonic_keyval = GDK_KEY_VoidSymbol;
   priv->layout = NULL;
-  priv->text = NULL;
+  priv->text = g_strdup ("");
   priv->attrs = NULL;
 
   priv->mnemonic_widget = NULL;