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[io] sink_vorbis: prevent crash on null path

--- a/src/io/sink_vorbis.c

+++ b/src/io/sink_vorbis.c

@@ -66,6 +66,11 @@

 {

   aubio_sink_vorbis_t * s = AUBIO_NEW(aubio_sink_vorbis_t);

+  if (!uri) {

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

+    goto failure;

+  }

+

   s->path = AUBIO_ARRAY(char_t, strnlen(uri, PATH_MAX) + 1);

   strncpy(s->path, uri, strnlen(uri, PATH_MAX) + 1);

   s->path[strnlen(uri, PATH_MAX)] = '\0';