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[sink_sndfile] preset_format does not fail on empty format string

--- a/src/io/sink_sndfile.c

+++ b/src/io/sink_sndfile.c

@@ -136,10 +136,12 @@

   } else if (atoi(fmt) > 0x010000) {

     s->format = atoi(fmt);

   } else {

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

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

     s->format = SF_FORMAT_WAV | SF_FORMAT_PCM_16;

-    return AUBIO_FAIL;

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

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

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

+      return AUBIO_FAIL;

+    }

   }

   return AUBIO_OK;

 }