reference count of gstreamer elements not decresing

[ShilVin]

Setting pipeline state to NULL state won't remove elements from the pipeline.
gst_element_set_state(m_pstGstConfig->pipeline, GST_STATE_NULL); 

unref of the object will unref all the elements. 
gst_object_unref(GST_PIPELINE(m_pstGstConfig->pipeline));

Use gst_bin_remove() function to remove only one element. This function will
reduce the ref count of the element by 1.





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