vrend: Use uint64_t to evaluate readback size
This is to avoid integer overflow. Bail out if the size is larger than UINT_MAX because glReadnPixels can't take larger buffers.
Closes: https://gitlab.freedesktop.org/virgl/virglrenderer/-/issues/459
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This is to avoid integer overflow. Bail out if the size is larger than UINT_MAX because glReadnPixels can't take larger buffers.
Closes: https://gitlab.freedesktop.org/virgl/virglrenderer/-/issues/459