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[io] prevent possible crash on empty string in source_apple_audio

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

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

@@ -59,7 +59,7 @@

 {

   aubio_source_apple_audio_t * s = AUBIO_NEW(aubio_source_apple_audio_t);

-  if (path == NULL) {

+  if (path == NULL || strnlen(path, PATH_MAX) < 1) {

     AUBIO_ERROR("source_apple_audio: Aborted opening null path\n");

     goto beach;

   }