SDL: SDL_os2messagebox.c: silence -Wmaybe-uninitialized.

SDL Commits
1 
From ba035c3a38c563371e7e5154c6da7494c0755eb5 Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Thu, 1 Oct 2026 23:55:24 +0300
Subject: [PATCH] SDL_os2messagebox.c: silence -Wmaybe-uninitialized.

---
 src/video/os2/SDL_os2messagebox.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/video/os2/SDL_os2messagebox.c b/src/video/os2/SDL_os2messagebox.c
index d52ec37d1f30c..11b3f00e7ac58 100644
--- a/src/video/os2/SDL_os2messagebox.c
+++ b/src/video/os2/SDL_os2messagebox.c
@@ -495,8 +495,8 @@ int OS2_ShowMessageBox(const SDL_MessageBoxData *messageboxdata, int *buttonid)
             *pSDLBtnData = (SDL_MessageBoxButtonData *)messageboxdata->buttons;
     ULONG   cSDLBtnData = messageboxdata->numbuttons;
     BOOL    fVideoInitialized = SDL_WasInit(SDL_INIT_VIDEO);
-    HAB     hab;
-    HMQ     hmq;
+    HAB     hab = NULLHANDLE;
+    HMQ     hmq = NULLHANDLE;
     BOOL    fSuccess = FALSE;
 
     if (!fVideoInitialized) {