Fix callbacks

garglk/sndsdl.c

@@ -410,13 +410,12 @@ void glk_schannel_set_volume_ext(schanid_t chan, glui32 vol,
 /* Notify the music channel completion */
 static void music_completion_callback()
 {
-    if (!music_channel)
+    if (!music_channel || !music_channel->resid)
     {
         gli_strict_warning("music callback failed");
         return;
     }
-
-    if (music_channel->notify && music_channel->resid)
+    else
     {
         gli_event_store(evtype_SoundNotify, 0, music_channel->resid,
             music_channel->notify);
@@ -428,15 +427,10 @@ static void music_completion_callback()
 static void sound_completion_callback(int chan)
 {
     channel_t *sound_channel = sound_channels[chan];
-    if (!sound_channel || Mix_Playing(chan))
-    {
-        gli_strict_warning("sound callback failed");
+
         if (!sound_channel)
-            fprintf(stderr, "sound_channel %d is NULL\n", chan);
-        if (Mix_Playing(chan))
         {
-            fprintf(stderr, "Mix_Playing(%d) is TRUE\n", chan);
-        }
+        fprintf(stderr, "sound_completion_callback called with invalid sound_channel %d\n", chan);
         return;
     }