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[io] prevent crash in sink on null path

--- a/src/io/sink.c

+++ b/src/io/sink.c

@@ -93,6 +93,7 @@

 static const char_t *aubio_get_extension(const char_t *filename)

 {

+  if (!filename) return NULL;

   // find last occurence of dot character

   const char_t *ext = strrchr(filename, '.');

   if (!ext || ext == filename) return "";

@@ -108,7 +109,7 @@

 #ifdef HAVE_VORBISENC

   // check if this uri could be for us

   uint_t match_oggstream = 0;

-  if (strcmp (uri_ext, "ogg") == 0) match_oggstream = 1;

+  if (uri_ext && strcmp (uri_ext, "ogg") == 0) match_oggstream = 1;

   if (match_oggstream) {

     s->sink = (void *)new_aubio_sink_vorbis(uri, samplerate);

     if (s->sink) {

@@ -128,7 +129,7 @@

 #ifdef HAVE_FLAC

   // check if this uri could be for us

   uint_t match_flacstream = 0;

-  if (strcmp (uri_ext, "flac") == 0) match_flacstream = 1;

+  if (uri_ext && strcmp (uri_ext, "flac") == 0) match_flacstream = 1;

   if (match_flacstream) {

     s->sink = (void *)new_aubio_sink_flac(uri, samplerate);

     if (s->sink) {