[file-roller] gtk-utils: fix missing string format argument

[Paolo Bacchilega <paobac src gnome org>]

commit 4c571adda097ea4a5b24f353d155a2a5ba883d66
Author: Tim Lunn <tim feathertop org>
Date:   Tue Mar 31 10:00:27 2015 +1100

    gtk-utils: fix missing string format argument
    
    https://bugzilla.gnome.org/show_bug.cgi?id=747065

 src/gtk-utils.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/gtk-utils.c b/src/gtk-utils.c
index cb9d92b..e1e1ab9 100644
--- a/src/gtk-utils.c
+++ b/src/gtk-utils.c
@@ -70,7 +70,7 @@ _gtk_message_dialog_new (GtkWindow      *parent,
                                         GTK_BUTTONS_NONE,
                                         "%s", message);
 
-       gtk_message_dialog_format_secondary_text (GTK_MESSAGE_DIALOG (dialog), secondary_message);
+       gtk_message_dialog_format_secondary_text (GTK_MESSAGE_DIALOG (dialog), "%s", secondary_message);
 
        if (flags & GTK_DIALOG_MODAL)
                _gtk_dialog_add_to_window_group (GTK_DIALOG (dialog));
@@ -211,7 +211,7 @@ _gtk_error_dialog_new (GtkWindow      *parent,
                secondary_message = g_strdup_vprintf (secondary_text_format, args);
                va_end (args);
 
-               gtk_message_dialog_format_secondary_text (GTK_MESSAGE_DIALOG (dialog), secondary_message);
+               gtk_message_dialog_format_secondary_text (GTK_MESSAGE_DIALOG (dialog), "%s", 
secondary_message);
 
                g_free (secondary_message);
        }