SDL: audio: More tweaking of `device->thread_alive`

SDL Commits
1

https://github.com/libsdl-org/SDL/commit/0999a090a7d5b51e2cf950f5819045f84a159cdf

From 0999a090a7d5b51e2cf950f5819045f84a159cdf Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <[EMAIL REDACTED]>
Date: Tue, 4 Jul 2023 17:27:17 -0400
Subject: [PATCH] audio: More tweaking of `device->thread_alive`

---
 src/audio/SDL_audio.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/audio/SDL_audio.c b/src/audio/SDL_audio.c
index 342024b791e2..aea09ff80767 100644
--- a/src/audio/SDL_audio.c
+++ b/src/audio/SDL_audio.c
@@ -668,6 +668,7 @@ void SDL_AudioThreadFinalize(SDL_AudioDevice *device)
         if (device->thread) {
             SDL_DetachThread(device->thread);  // no one is waiting for us, just detach ourselves.
             device->thread = NULL;
+            SDL_AtomicSet(&device->thread_alive, 0);
         }
         DestroyPhysicalAudioDevice(device);
     }
@@ -1085,6 +1086,7 @@ static void ClosePhysicalAudioDevice(SDL_AudioDevice *device)
             SDL_WaitThread(device->thread, NULL);
             device->thread = NULL;
         }
+        SDL_AtomicSet(&device->thread_alive, 0);
     }
 
     if (device->is_opened) {