[gnome-calendar] source-dialog: use GtkEntry::get_text_length

[Erick Pérez Castellanos <erickpc src gnome org>]

commit bbcd5bcc494816541f024fdeda4d98e3014fbebe
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Wed May 6 09:31:40 2015 -0300

    source-dialog: use GtkEntry::get_text_length

 src/gcal-source-dialog.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/gcal-source-dialog.c b/src/gcal-source-dialog.c
index a8506af..1f4943c 100644
--- a/src/gcal-source-dialog.c
+++ b/src/gcal-source-dialog.c
@@ -675,7 +675,7 @@ name_entry_text_changed (GObject    *object,
   GcalSourceDialogPrivate *priv = GCAL_SOURCE_DIALOG (user_data)->priv;
   gboolean valid;
 
-  valid = g_utf8_strlen (gtk_entry_get_text (GTK_ENTRY (object)), -1) > 0;
+  valid = gtk_entry_get_text_length (GTK_ENTRY (object)) > 0;
 
   gtk_widget_set_sensitive (priv->back_button, valid);
   gtk_widget_set_sensitive (priv->add_button, valid);