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src/temporal/resampler.c: safer new_ and del_

--- a/src/temporal/resampler.c

+++ b/src/temporal/resampler.c

@@ -42,9 +42,12 @@

   aubio_resampler_t *s = AUBIO_NEW (aubio_resampler_t);

   int error = 0;

   s->stat = src_new (type, 1, &error);  /* only one channel */

+  if (error) {

+    AUBIO_ERR ("Failed creating resampler: %s\n", src_strerror (error));

+    del_aubio_resampler(s);

+    return NULL;

+  }

   s->proc = AUBIO_NEW (SRC_DATA);

-  if (error)

-    AUBIO_ERR ("%s\n", src_strerror (error));

   s->ratio = ratio;

   return s;

 }

@@ -52,7 +55,7 @@

 void

 del_aubio_resampler (aubio_resampler_t * s)

 {

-  src_delete (s->stat);

+  if (s->stat) src_delete (s->stat);

   AUBIO_FREE (s->proc);

   AUBIO_FREE (s);

 }