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[sink_apple_audio] preset_format does not fail on empty format string

--- a/src/io/sink_apple_audio.c

+++ b/src/io/sink_apple_audio.c

@@ -143,10 +143,12 @@

     // only use lossy codec for "aac"

     s->fileType = kAudioFileAIFFType;

   } else {

-    AUBIO_WRN("sink_apple_audio: could not guess format for %s,"

-       " using default (wav)\n", s->path);

     s->fileType = kAudioFileWAVEType;

-    return AUBIO_FAIL;

+    if (fmt && strnlen(fmt, PATH_MAX)) {

+      AUBIO_WRN("sink_apple_audio: could not guess format for %s,"

+         " using default (wav)\n", s->path);

+      return AUBIO_FAIL;

+    }

   }

   return AUBIO_OK;

 }