SDL: SDL_render_d3d12.c: Fix uninitialized warning for CreateEventExFunc

SDL Commits
1 
From c23fb235c8ed9eda0949e4b63de4ac7048dc236b Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Fri, 16 Sep 2022 17:20:56 +0300
Subject: [PATCH] SDL_render_d3d12.c: Fix uninitialized warning for
 CreateEventExFunc

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

diff --git a/src/render/direct3d12/SDL_render_d3d12.c b/src/render/direct3d12/SDL_render_d3d12.c
index 832d4c8f799..3fde465b674 100644
--- a/src/render/direct3d12/SDL_render_d3d12.c
+++ b/src/render/direct3d12/SDL_render_d3d12.c
@@ -757,6 +757,7 @@ D3D12_CreateDeviceResources(SDL_Renderer* renderer)
     /* CreateEventEx() arrived in Vista, so we need to load it with GetProcAddress for XP. */
     {
         HMODULE kernel32 = GetModuleHandle(TEXT("kernel32.dll"));
+        CreateEventExFunc = NULL;
         if (kernel32) {
             CreateEventExFunc = (PFN_CREATE_EVENT_EX) GetProcAddress(kernel32, "CreateEventExW");
         }