fix some -Wincompatible-pointer-types warnings

Author: raveit65

src/eom-save-as-dialog-helper.c

@@ -241,7 +241,7 @@ eom_save_as_dialog_new (GtkWindow *main, GList *images, GFile *base_file)
 	data->n_images = g_list_length (images);
 	data->nth_image = (int) ((float) data->n_images * rand() / (float) (RAND_MAX+1.0));
 	g_assert (data->nth_image >= 0 && data->nth_image < data->n_images);
-	data->image = g_object_ref (G_OBJECT (g_list_nth_data (images, data->nth_image)));
+	data->image = g_object_ref (EOM_IMAGE (g_list_nth_data (images, data->nth_image)));
 	g_object_set_data_full (G_OBJECT (dlg), "data", data, destroy_data_cb);
 
 	g_signal_connect (G_OBJECT (data->format_combobox), "changed",

src/eom-scroll-view.c

@@ -2161,7 +2161,7 @@ eom_scroll_view_set_popup (EomScrollView *view,
 	g_return_if_fail (EOM_IS_SCROLL_VIEW (view));
 	g_return_if_fail (view->priv->menu == NULL);
 
-	view->priv->menu = g_object_ref (menu);
+	view->priv->menu = g_object_ref (GTK_WIDGET (menu));
 
 	gtk_menu_attach_to_widget (GTK_MENU (view->priv->menu),
 				   GTK_WIDGET (view),

src/eom-thumb-view.c

@@ -1046,7 +1046,7 @@ eom_thumb_view_set_thumbnail_popup (EomThumbView *thumbview,
 	g_return_if_fail (EOM_IS_THUMB_VIEW (thumbview));
 	g_return_if_fail (thumbview->priv->menu == NULL);
 
-	thumbview->priv->menu = g_object_ref (menu);
+	thumbview->priv->menu = g_object_ref (GTK_WIDGET (menu));
 
 	gtk_menu_attach_to_widget (GTK_MENU (thumbview->priv->menu),
 				   GTK_WIDGET (thumbview),