audiofilter: don't leak pad-template

gst_element_class_add_pad_template() does not take ownership.

gst-libs/gst/audio/gstaudiofilter.c

@@ -220,16 +220,19 @@ gst_audio_filter_class_add_pad_templates (GstAudioFilterClass * klass,
     const GstCaps * allowed_caps)
 {
   GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
+  GstPadTemplate *pad_template;
 
   g_return_if_fail (GST_IS_AUDIO_FILTER_CLASS (klass));
   g_return_if_fail (allowed_caps != NULL);
   g_return_if_fail (GST_IS_CAPS (allowed_caps));
 
-  gst_element_class_add_pad_template (element_class,
-      gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
-          gst_caps_copy (allowed_caps)));
+  pad_template = gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
+      gst_caps_copy (allowed_caps));
+  gst_element_class_add_pad_template (element_class, pad_template);
+  gst_object_unref (pad_template);
 
-  gst_element_class_add_pad_template (element_class,
-      gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
-          gst_caps_copy (allowed_caps)));
+  pad_template = gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
+      gst_caps_copy (allowed_caps));
+  gst_element_class_add_pad_template (element_class, pad_template);
+  gst_object_unref (pad_template);
 }