Explicitly cast screen coordinates in set_pixel

src/window/window.c

@@ -112,7 +112,7 @@ void set_pixel(window_t *wnd, i32 x, i32 y, colour_t colour) {
 
   SDL_LockSurface(wnd->back_buffer);
 
-  set_screen_pixel(wnd, screen_x, screen_y, colour);
+  set_screen_pixel(wnd, (u32)screen_x, (u32)screen_y, colour);
 
   SDL_UnlockSurface(wnd->back_buffer);
 }