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src/io/source_apple_audio.c: allow closing twice

--- a/src/io/source_apple_audio.c

+++ b/src/io/source_apple_audio.c

@@ -279,7 +279,7 @@

 uint_t aubio_source_apple_audio_close (aubio_source_apple_audio_t *s)

 {

   OSStatus err = noErr;

-  if (!s->audioFile) { return AUBIO_FAIL; }

+  if (!s->audioFile) { return AUBIO_OK; }

   err = ExtAudioFileDispose(s->audioFile);

   s->audioFile = NULL;

   if (err) {