clover: Initialize command_queue member _props.

Fix defect reported by Coverity Scan.

Uninitialized scalar variable (UNINIT) uninit_use: Using uninitialized value this->_props. _props |= properties[i + 1];

Fixes: e42a7fa0 ("clover: add support command queue properties") Signed-off-by: Vinson Lee vlee@freedesktop.org

cc: @airlied