SDL: testmessage: fix conversion from `intptr_t` to `Uint32`

SDL Commits
1 
From 7ae5d8d406713782be4c3c5d4d0c0cb0754c7fbc Mon Sep 17 00:00:00 2001
From: Anonymous Maarten <[EMAIL REDACTED]>
Date: Thu, 6 Oct 2022 01:15:49 +0200
Subject: [PATCH] testmessage: fix conversion from `intptr_t` to `Uint32`

Emitted by MSVC
---
 test/testmessage.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/test/testmessage.c b/test/testmessage.c
index 5dd0155f75e0..c30c18df46e1 100644
--- a/test/testmessage.c
+++ b/test/testmessage.c
@@ -62,7 +62,7 @@ button_messagebox(void *eventNumber)
         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Error Presenting MessageBox: %s\n", SDL_GetError());
         if (eventNumber) {
             SDL_Event event;
-            event.type = (intptr_t)eventNumber;
+            event.type = (Uint32)(intptr_t)eventNumber;
             SDL_PushEvent(&event);
             return 1;
         } else {
@@ -73,7 +73,7 @@ button_messagebox(void *eventNumber)
 
     if (eventNumber) {
         SDL_Event event;
-        event.type = (intptr_t)eventNumber;
+        event.type = (Uint32)(intptr_t)eventNumber;
         SDL_PushEvent(&event);
     }