SDL: wayland: Fix leaked zxdg_decoration_manager

SDL Commits
1 
From 6fd37194bc178dacbda1cb222fb47a44031b2636 Mon Sep 17 00:00:00 2001
From: David Edmundson <[EMAIL REDACTED]>
Date: Wed, 7 Apr 2021 16:03:41 +0100
Subject: [PATCH] wayland: Fix leaked zxdg_decoration_manager

---
 src/video/wayland/SDL_waylandvideo.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/video/wayland/SDL_waylandvideo.c b/src/video/wayland/SDL_waylandvideo.c
index b3b4691ac..e017747a4 100644
--- a/src/video/wayland/SDL_waylandvideo.c
+++ b/src/video/wayland/SDL_waylandvideo.c
@@ -564,6 +564,9 @@ Wayland_VideoQuit(_THIS)
     if (data->shell.zxdg)
         zxdg_shell_v6_destroy(data->shell.zxdg);
 
+    if (data->decoration_manager)
+        zxdg_decoration_manager_v1_destroy(data->decoration_manager);
+
     if (data->compositor)
         wl_compositor_destroy(data->compositor);