Clear compiler warnings

Thanks to chjj/compton#445

src/compton.c

@@ -1722,6 +1722,8 @@ win_paint_win(session_t *ps, win *w, XserverRegion reg_paint,
             reg_paint, pcache_reg);
         break;
 #endif
+      default:
+        assert(false);
     }
   }
 
@@ -2666,29 +2668,6 @@ win_on_factor_change(session_t *ps, win *w) {
         ps->o.unredir_if_possible_blacklist, &w->cache_uipblst);
 }
 
-/**
- * Process needed window updates.
- */
-static void
-win_upd_run(session_t *ps, win *w, win_upd_t *pupd) {
-  if (pupd->shadow) {
-    win_determine_shadow(ps, w);
-    pupd->shadow = false;
-  }
-  if (pupd->fade) {
-    win_determine_fade(ps, w);
-    pupd->fade = false;
-  }
-  if (pupd->invert_color) {
-    win_determine_invert_color(ps, w);
-    pupd->invert_color = false;
-  }
-  if (pupd->focus) {
-    win_update_focused(ps, w);
-    pupd->focus = false;
-  }
-}
-
 /**
  * Update cache data in struct _win that depends on window size.
  */
@@ -3444,8 +3423,6 @@ wid_get_prop_window(session_t *ps, Window wid, Atom aprop) {
  */
 static void
 win_update_focused(session_t *ps, win *w) {
-  bool focused_old = w->focused;
-
   if (UNSET != w->focused_force) {
     w->focused = w->focused_force;
   }
@@ -6622,6 +6599,8 @@ init_filters(session_t *ps) {
             return false;
         }
 #endif
+      default:
+        assert(false);
     }
   }