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va: fix memory error when elements from different GPU devices connect in one pipeline.

He Junyan requested to merge He_Junyan/gstreamer:multi_gpu_mem into main

The pipeline such as:

gst-launch-1.0 -vf filesrc location=test.264 ! h264parse ! vah264dec ! queue ! varenderD129postproc ! fakesink

may cause pipeline error and even GPU hang for multi device environment.

We should report the correct error and at least avoid GPU hang.

Fixes: #1167 (closed)

Edited by Seungha Yang

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