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vrend: check qbo resource is valid

Juston Li requested to merge justonli/virglrenderer:vrend-query-buffer-2 into main

If res->id is 0 then no buffer ends up binding to GL_QUERY_BUFFER and "If no buffer is bound to GL_QUERY_RESULT_BUFFER, then params is treated as an address in client memory of a variable to receive the resulting data."

Tested glcts --deqp-case=KHR-GL46.*query*


/cc @linyaa @tintou @gerddie @digetx

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