vrend: Check index buffer size before submitting draw operation
If the index buffer is not big enough, it will result OOB access.
Closes: https://gitlab.freedesktop.org/virgl/virglrenderer/-/issues/480
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If the index buffer is not big enough, it will result OOB access.
Closes: https://gitlab.freedesktop.org/virgl/virglrenderer/-/issues/480