Added some (harmlessly) missing braces.

src/events/SDL_mouse.c

@@ -474,11 +474,13 @@ SDL_WarpMouseInWindow(SDL_Window * window, int x, int y)
 {
     SDL_Mouse *mouse = SDL_GetMouse();
 
-    if ( window == NULL )
+    if ( window == NULL ) {
         window = mouse->focus;
+    }
 
-    if ( window == NULL )
+    if ( window == NULL ) {
         return;
+    }
 
     if (mouse->WarpMouse) {
         mouse->WarpMouse(window, x, y);