Commits on Sep 9, 2022

1. Fix: replicate gst_sample_get_buffer{,list} returns NULL semantic …

   gst_sample_get_buffer{,list} returns NULL if a buffer{,list} has
   not been set.  Previous go-gst behaviour wrapped this NULL pointer
   in the respective go-gst proxy object.
   
   This causes a problem with AppSink when one needs to disambiguate
   between whether a GstSample contains a GstBufferList, a GstBuffer
   or indeed nothing at all.  For example:
   
   ```
   sink := app.SinkFromElement(element)
   sink.SetBufferListSupport(true)
   sink.SetCallbacks(&app.SinkCallbacks{
   	NewSampleFunc: func(sink *app.Sink) gst.FlowReturn {
   		if sample := sink.PullSample(); sample == nil {
   			return gst.FlowEOS
   		} else if bufferList := sample.GetBufferList(); bufferList != nil {
   			// consume bufferlist
   			return gst.FlowOK
   		} else if buffer := sample.GetBuffer(); buffer != nil {
   			// consume buffer
   			return gst.FlowOK
   		} else {
   			return gst.FlowError
   		}
   	},
   })
   ```

   Atish Nazir committed Sep 9, 2022
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