bug 1149376 release leaking GstIterator holding on to mPlayBin r=cajbir

--HG--
extra : rebase_source : 3746864d01b6b1eba86de3b2af9854303f409138

dom/media/gstreamer/GStreamerFunctionList.h

@@ -48,6 +48,7 @@ GST_FUNC(LIBGSTREAMER, gst_element_set_state)
 GST_FUNC(LIBGSTREAMER, gst_flow_get_name)
 GST_FUNC(LIBGSTREAMER, gst_init)
 GST_FUNC(LIBGSTREAMER, gst_init_check)
+GST_FUNC(LIBGSTREAMER, gst_iterator_free)
 GST_FUNC(LIBGSTREAMER, gst_iterator_next)
 GST_FUNC(LIBGSTREAMER, gst_message_parse_error)
 GST_FUNC(LIBGSTREAMER, gst_message_type_get_name)

dom/media/gstreamer/GStreamerReader.cpp

@@ -607,6 +607,8 @@ nsresult GStreamerReader::CheckSupportedFormats()
     }
   }
 
+  gst_iterator_free(it);
+
   return unsupported ? NS_ERROR_FAILURE : NS_OK;
 }