[gtk+] mir: fix compilation in mirscreen

[Marco Trevisan <marcotrevi src gnome org>]

commit 8bc523ef5915d4ab7ced843929c8e3f1bf754016
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Fri Nov 14 23:18:10 2014 +0100

    mir: fix compilation in mirscreen

 gdk/mir/gdkmirscreen.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/gdk/mir/gdkmirscreen.c b/gdk/mir/gdkmirscreen.c
index 82f1ae6..2b53cef 100644
--- a/gdk/mir/gdkmirscreen.c
+++ b/gdk/mir/gdkmirscreen.c
@@ -383,7 +383,10 @@ gdk_mir_screen_get_monitor_geometry (GdkScreen    *screen,
     }
   else
     {
-      *dest = {0, 0, 0, 0};
+      dest->x = 0;
+      dest->y = 0;
+      dest->width = 0;
+      dest->height = 0;
     }
 }