i3 - improved tiling WM

Initialize size hints struct on manage

Patch status: needinfo

Patch by Tony Crisci

Long description:

Since the declaration of wm_size_hints in manage_window is local, it may
initially contain garbage values. Since this variable is later used in a
conditional, it must be zeroed to be reliable.

To apply this patch, use:
curl http://cr.i3wm.org/patch/456/raw.patch | git am

b/src/manage.c

16 
@@ -198,6 +198,7 @@ void manage_window(xcb_window_t window, xcb_get_window_attributes_cookie_t cooki
17 
     border_style_t motif_border_style = BS_NORMAL;
18 
     window_update_motif_hints(cwindow, xcb_get_property_reply(conn, motif_wm_hints_cookie, NULL), &motif_border_style);
19 
     xcb_size_hints_t wm_size_hints;
20 
+    memset(&wm_size_hints, 0, sizeof(xcb_size_hints_t));
21 
     xcb_icccm_get_wm_size_hints_reply(conn, wm_normal_hints_cookie, &wm_size_hints, NULL);
22 
     xcb_get_property_reply_t *type_reply = xcb_get_property_reply(conn, wm_type_cookie, NULL);
23 
     xcb_get_property_reply_t *state_reply = xcb_get_property_reply(conn, state_cookie, NULL);