SDL: avoid NullPointer in SDL_GetRenderTarget

SDL Commits
1 
From 0adb67017b76086da909382a632b288e17cf5848 Mon Sep 17 00:00:00 2001
From: pionere <[EMAIL REDACTED]>
Date: Tue, 12 Apr 2022 09:01:17 +0200
Subject: [PATCH] avoid NullPointer in SDL_GetRenderTarget

---
 src/render/SDL_render.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/render/SDL_render.c b/src/render/SDL_render.c
index 9bb953eddeb..1068150ebfd 100644
--- a/src/render/SDL_render.c
+++ b/src/render/SDL_render.c
@@ -2263,6 +2263,8 @@ SDL_SetRenderTarget(SDL_Renderer *renderer, SDL_Texture *texture)
 SDL_Texture *
 SDL_GetRenderTarget(SDL_Renderer *renderer)
 {
+    CHECK_RENDERER_MAGIC(renderer, NULL);
+
     return renderer->target;
 }