Call audio backend shutdown if the library init or buffer alloc fails :

Issue reported by Hubert Maier for AmigaOS4, but it is actually generic
and was present in older releases, too

Also call amiga_sysinit() before the other two in amiga-specific builds

src/player/wildmidi.c

@@ -538,6 +538,10 @@ int main(int argc, char **argv) {
         config_file[sizeof(config_file) - 1] = 0;
     }
 
+#ifdef WILDMIDI_AMIGA
+    amiga_sysinit();
+#endif
+
     printf("Initializing Sound System (%s)\n", available_outputs[playback_id]->name);
 
     if (available_outputs[playback_id]->open_out(output, &rate) == -1) {
@@ -550,26 +554,25 @@ int main(int argc, char **argv) {
                         (libraryver>> 8) & 255,
                         (libraryver    ) & 255);
     if (WildMidi_Init(config_file, rate, mixer_options) == -1) {
+        available_outputs[playback_id]->close_out();
         fprintf(stderr, "%s\r\n", WildMidi_GetError());
         WildMidi_ClearError();
         return (1);
     }
 
-    printf(" +  Volume up        e  Better resampling    n  Next Midi\n");
-    printf(" -  Volume down      l  Log volume           q  Quit\n");
-    printf(" ,  1sec Seek Back   r  Reverb               .  1sec Seek Forward\n");
-    printf(" m  save as midi     p  Pause On/Off\n\n");
-
     output_buffer = malloc(16384);
     if (output_buffer == NULL) {
         fprintf(stderr, "Not enough memory, exiting\n");
+        available_outputs[playback_id]->close_out();
         WildMidi_Shutdown();
         return (1);
     }
 
-#ifdef WILDMIDI_AMIGA
-    amiga_sysinit();
-#endif
+    printf(" +  Volume up        e  Better resampling    n  Next Midi\n");
+    printf(" -  Volume down      l  Log volume           q  Quit\n");
+    printf(" ,  1sec Seek Back   r  Reverb               .  1sec Seek Forward\n");
+    printf(" m  save as midi     p  Pause On/Off\n\n");
+
     wm_inittty();
 
     WildMidi_MasterVolume(master_volume);