SDL: gpu: Update comments above CHECK_DEVICE_MAGIC macro

SDL Commits
1 
From 415cc64d2f94cb174cc0ad29a9b3f4e196f0a0b1 Mon Sep 17 00:00:00 2001
From: Ethan Lee <[EMAIL REDACTED]>
Date: Sun, 1 Feb 2026 13:54:27 -0500
Subject: [PATCH] gpu: Update comments above CHECK_DEVICE_MAGIC macro

---
 src/gpu/SDL_gpu.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/gpu/SDL_gpu.c b/src/gpu/SDL_gpu.c
index 11b0b1210093b..bea650cd77177 100644
--- a/src/gpu/SDL_gpu.c
+++ b/src/gpu/SDL_gpu.c
@@ -21,7 +21,12 @@
 #include "SDL_internal.h"
 #include "SDL_sysgpu.h"
 
-// FIXME: This could probably use SDL_ObjectValid
+/* Normally this macro would use something like SDL_IsObjectValid, but in GPU's
+ * case we prioritize performance and be more trusting of application behavior
+ * than, say, SDL_Render, so trust that applications will be careful about
+ * disposing the device and its resources.
+ * -flibit
+ */
 #define CHECK_DEVICE_MAGIC(device, retval)  \
     CHECK_PARAM(device == NULL) {           \
         SDL_SetError("Invalid GPU device"); \