element: remove useless ret test
Use GST_ELEMENT_REGISTER_DEFINE_CUSTOM instead of GST_ELEMENT_REGISTER_DEFINE_WITH_CODE if a specific init needs to be tested before registering the element.
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Use GST_ELEMENT_REGISTER_DEFINE_CUSTOM instead of GST_ELEMENT_REGISTER_DEFINE_WITH_CODE if a specific init needs to be tested before registering the element.