Removed the SDL_AUDIO_ALSA_DEBUG environment variable

The debug info is available if you set SDL_HINT_LOGGING to "audio=debug"

docs/README-migration.md

@@ -802,6 +802,7 @@ The following hints have been removed:
 * SDL_HINT_AUDIO_DEVICE_APP_NAME - replaced by either using the appname param to SDL_SetAppMetadata() or setting SDL_PROP_APP_METADATA_NAME_STRING with SDL_SetAppMetadataProperty()
 
 The following environment variables have been removed:
+* SDL_AUDIO_ALSA_DEBUG - replaced by setting the hint SDL_HINT_LOGGING to "audio=debug"
 * SDL_DUMMYAUDIODELAY - replaced with the hint SDL_HINT_AUDIO_DUMMY_TIMESCALE which allows scaling the audio time rather than specifying an absolute delay.
 
 The following functions have been removed:

src/audio/alsa/SDL_alsa_audio.c

@@ -426,16 +426,11 @@ static int ALSA_set_buffer_size(SDL_AudioDevice *device, snd_pcm_hw_params_t *pa
     device->sample_frames = persize;
 
     // This is useful for debugging
-    if (SDL_getenv("SDL_AUDIO_ALSA_DEBUG")) {
-        snd_pcm_uframes_t bufsize;
-
-        ALSA_snd_pcm_hw_params_get_buffer_size(hwparams, &bufsize);
-
-        SDL_LogError(SDL_LOG_CATEGORY_AUDIO,
-                     "ALSA: period size = %ld, periods = %u, buffer size = %lu",
-                     persize, periods, bufsize);
-    }
-
+    snd_pcm_uframes_t bufsize;
+    ALSA_snd_pcm_hw_params_get_buffer_size(hwparams, &bufsize);
+    SDL_LogDebug(SDL_LOG_CATEGORY_AUDIO,
+                 "ALSA: period size = %ld, periods = %u, buffer size = %lu",
+                 persize, periods, bufsize);
     return 0;
 }