[gnome-shell] shell_global_get_primary_monitor: Use variable to store number of monitors

[Adel Gadllah <agadllah src gnome org>]

commit bae07700a18db0a462d37f0558063aaa9040ed3d
Author: Adel Gadllah <adel gadllah gmail com>
Date:   Sun Apr 4 18:11:37 2010 +0200

    shell_global_get_primary_monitor: Use variable to store number of monitors
    
    See https://bugzilla.gnome.org/show_bug.cgi?id=608647#c5
    (forgot to add it before commiting).

 src/shell-global.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/shell-global.c b/src/shell-global.c
index 92855c5..8077b9d 100644
--- a/src/shell-global.c
+++ b/src/shell-global.c
@@ -1107,8 +1107,9 @@ shell_global_get_primary_monitor (ShellGlobal  *global)
   GdkRectangle rect;
   gint i, primary = 0;
   gchar *output_name = NULL;
+  gint num_monitors = gdk_screen_get_n_monitors (screen);
 
-  for (i = 0; i < gdk_screen_get_n_monitors (screen); i++)
+  for (i = 0; i < num_monitors; i++)
     {
       /* Prefer the laptop's internal screen if present */
       output_name = gdk_screen_get_monitor_plug_name (screen, i);