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src/io/source_sndfile.c: avoid seeking in closed file

--- a/src/io/source_sndfile.c

+++ b/src/io/source_sndfile.c

@@ -295,6 +295,11 @@

 uint_t aubio_source_sndfile_seek (aubio_source_sndfile_t * s, uint_t pos) {

   uint_t resampled_pos = (uint_t)ROUND(pos / s->ratio);

   sf_count_t sf_ret = sf_seek (s->handle, resampled_pos, SEEK_SET);

+  if (s->handle == NULL) {

+    AUBIO_ERR("source_sndfile: failed seeking in %s (file not opened?)\n",

+        s->path);

+    return AUBIO_FAIL;

+  }

   if (sf_ret == -1) {

     AUBIO_ERR("source_sndfile: Failed seeking %s at %d: %s\n", s->path, pos, sf_strerror (NULL));

     return AUBIO_FAIL;

-- 

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