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gstindex: Make sure writer is non-NULL.
Fixes the NULL dereference a few lines lower (where it gets the object type).
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@ -616,6 +616,8 @@ static gboolean
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gst_index_gtype_resolver (GstIndex * index, GstObject * writer,
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gchar ** writer_string, gpointer data)
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{
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g_return_val_if_fail (writer != NULL, FALSE);
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if (GST_IS_PAD (writer)) {
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GstElement *element =
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(GstElement *) gst_object_get_parent (GST_OBJECT (writer));
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