virgl: skip empty cmdbufs
Several empty cmdbufs may be submitted by the GL app and the X server per frame (for example, from glamor_block_handler). Let's skip them.
Signed-off-by: Chia-I Wu olvaffe@gmail.com
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Several empty cmdbufs may be submitted by the GL app and the X server per frame (for example, from glamor_block_handler). Let's skip them.
Signed-off-by: Chia-I Wu olvaffe@gmail.com