[gimp] app: don't assign variable before checking the validity

[Hartmut Kuhse <hartmutkuhse src gnome org>]

commit ef66ea296dadd0a42fc5d1bfffd430ae8ee1aedb
Author: Hartmut Kuhse <hk_priv gmx de>
Date:   Mon Mar 9 08:28:33 2015 +0100

    app: don't assign variable before checking the validity

 app/widgets/gimpsessioninfo.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/app/widgets/gimpsessioninfo.c b/app/widgets/gimpsessioninfo.c
index 6f3642f..00b40bf 100644
--- a/app/widgets/gimpsessioninfo.c
+++ b/app/widgets/gimpsessioninfo.c
@@ -738,7 +738,7 @@ gimp_session_info_read_geometry (GimpSessionInfo   *info,
                                  GdkEventConfigure *cevent)
 {
   GdkWindow *window;
-  GdkScreen *screen  = gtk_widget_get_screen (info->p->widget);
+  GdkScreen *screen;
 
   g_return_if_fail (GIMP_IS_SESSION_INFO (info));
   g_return_if_fail (GTK_IS_WINDOW (info->p->widget));