vah265dec: Fix end_picture() vmethod.
Since commit 88437a9c the signature of h265decoder's end_picture() changed to return GstFlowReturn, but vah265dec was not updated.
This commit fixes this regression.
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Since commit 88437a9c the signature of h265decoder's end_picture() changed to return GstFlowReturn, but vah265dec was not updated.
This commit fixes this regression.