SDL: alsa: Fix use-after-free when reinitializing

SDL Commits
1 
From 78013aeef9134816528cf32d65699484e056c57e Mon Sep 17 00:00:00 2001
From: Cameron Gutman <[EMAIL REDACTED]>
Date: Fri, 12 Nov 2021 16:57:24 -0600
Subject: [PATCH] alsa: Fix use-after-free when reinitializing

---
 src/audio/alsa/SDL_alsa_audio.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/audio/alsa/SDL_alsa_audio.c b/src/audio/alsa/SDL_alsa_audio.c
index b9062e245c..d6f2a1050d 100644
--- a/src/audio/alsa/SDL_alsa_audio.c
+++ b/src/audio/alsa/SDL_alsa_audio.c
@@ -991,6 +991,7 @@ ALSA_Deinitialize(void)
         SDL_free(dev->name);
         SDL_free(dev);
     }
+    hotplug_devices = NULL;
 
     UnloadALSALibrary();
 }