SDL: GPU: Fix segfault when copying to Vulkan swapchain (#15543)

SDL Commits
1 
From 76f8705c1243640c7933f05fddf75f3e16fd7dff Mon Sep 17 00:00:00 2001
From: Evan Hemsley <[EMAIL REDACTED]>
Date: Mon, 11 May 2026 11:42:11 -0700
Subject: [PATCH] GPU: Fix segfault when copying to Vulkan swapchain (#15543)

---
 src/gpu/vulkan/SDL_gpu_vulkan.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/gpu/vulkan/SDL_gpu_vulkan.c b/src/gpu/vulkan/SDL_gpu_vulkan.c
index b366f7211f541..56074c96ad7d2 100644
--- a/src/gpu/vulkan/SDL_gpu_vulkan.c
+++ b/src/gpu/vulkan/SDL_gpu_vulkan.c
@@ -2500,6 +2500,11 @@ static void VULKAN_INTERNAL_TrackTextureTransfer(
     VulkanCommandBuffer *commandBuffer,
     VulkanTexture *texture)
 {
+    // Textures not managed by our allocator (i.e. the swapchain) don't need to be refcounted.
+    if (texture->usedRegion == NULL) {
+        return;
+    }
+
     TRACK_RESOURCE(
         texture,
         VulkanTexture *,