[mutter] boxes: Make pointer declaration match code style

[Marge Bot <marge-bot src gnome org>]

commit cbc6965b80a720d00efe4e230c7effc58946f223
Author: Björn Daase <bjoern daase net>
Date:   Fri Jan 14 20:02:26 2022 +0100

    boxes: Make pointer declaration match code style
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2236>

 src/core/boxes.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/core/boxes.c b/src/core/boxes.c
index f4ec5408ae..fabc69753d 100644
--- a/src/core/boxes.c
+++ b/src/core/boxes.c
@@ -429,7 +429,7 @@ merge_spanning_rects_in_region (GList *region)
    * considerations that also apply to this function.
    */
 
-  GList* compare;
+  GList *compare;
   compare = region;
 
   if (region == NULL)