SDL: audio: Set error message on dsp init failure.

SDL Commits
1 
From 24ffcbd9adc8ca02f5b60d2e0ebdac761f3644aa Mon Sep 17 00:00:00 2001
From: Eddy Jansson <[EMAIL REDACTED]>
Date: Sun, 20 Mar 2022 17:23:34 +0100
Subject: [PATCH] audio: Set error message on dsp init failure.

if SDL_EnumUnixAudioDevices() fails to find any devices,
set an error message on the exit path. Without this,
SDL_Init() could fail without any message available
in SDL_GetError().
---
 src/audio/dsp/SDL_dspaudio.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/audio/dsp/SDL_dspaudio.c b/src/audio/dsp/SDL_dspaudio.c
index 8d4ee943557..531612a2985 100644
--- a/src/audio/dsp/SDL_dspaudio.c
+++ b/src/audio/dsp/SDL_dspaudio.c
@@ -308,6 +308,7 @@ DSP_Init(SDL_AudioDriverImpl * impl)
     InitTimeDevicesExist = SDL_FALSE;
     SDL_EnumUnixAudioDevices(0, look_for_devices_test);
     if (!InitTimeDevicesExist) {
+        SDL_SetError("dsp: No such audio device");
         return SDL_FALSE;  /* maybe try a different backend. */
     }