run clang-format (3.5.0)

Not quite sure why there are so many differences. Perhaps we’ve gotten
out of the habit of running clang-format after every change.

I guess it’d be best to have a travis hook that runs clang-format for us
and reports any problems on pull requests.

src/util.c

@@ -42,17 +42,17 @@ bool rect_contains(Rect rect, uint32_t x, uint32_t y) {
 }
 
 Rect rect_add(Rect a, Rect b) {
-    return (Rect) {a.x + b.x,
-                   a.y + b.y,
-                   a.width + b.width,
-                   a.height + b.height};
+    return (Rect){a.x + b.x,
+                  a.y + b.y,
+                  a.width + b.width,
+                  a.height + b.height};
 }
 
 Rect rect_sub(Rect a, Rect b) {
-    return (Rect) {a.x - b.x,
-                   a.y - b.y,
-                   a.width - b.width,
-                   a.height - b.height};
+    return (Rect){a.x - b.x,
+                  a.y - b.y,
+                  a.width - b.width,
+                  a.height - b.height};
 }
 
 /*