SDL: Fixed build warning (2d62c)

SDL Commits
1 
From 2d62c65a7547ad0c42f3124ed7ee0bca0e85ce99 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Tue, 10 Oct 2023 12:37:38 -0700
Subject: [PATCH] Fixed build warning

---
 src/render/direct3d12/SDL_render_d3d12.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/render/direct3d12/SDL_render_d3d12.c b/src/render/direct3d12/SDL_render_d3d12.c
index 161bc700bd21..fb18838dce0e 100644
--- a/src/render/direct3d12/SDL_render_d3d12.c
+++ b/src/render/direct3d12/SDL_render_d3d12.c
@@ -1707,7 +1707,7 @@ static int D3D12_UpdateTextureInternal(D3D12_RenderData *rendererData, ID3D12Res
 
     src = (const Uint8 *)pixels;
     dst = textureMemory;
-    length = RowLength;
+    length = (UINT)RowLength;
     if (length == (UINT)pitch && length == RowPitch) {
         SDL_memcpy(dst, src, (size_t)length * NumRows);
     } else {