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src/io/source_sndfile.c: make sure seek position is >= 0

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

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

@@ -300,6 +300,11 @@

         s->path);

     return AUBIO_FAIL;

   }

+  if ((sint_t)pos < 0) {

+    AUBIO_ERR("source_sndfile: could not seek %s at %d (seeking position"

+       " should be >= 0)\n", s->path, pos);

+    return AUBIO_FAIL;

+  }

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

   if (sf_ret == -1) {

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