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Map is used but not Initialized. Map is called by IoMmuMap, in which Mapping(Map) is called by IoMmu->Map. We can not assume Map is given an initial value at any step. Cc: Hao A Wu <hao.a.wu@intel.com> Cc: Ray Ni <ray.ni@intel.com> Signed-off-by: Shenglei Zhang <shenglei.zhang@intel.com> Reviewed-by: Hao A Wu <hao.a.wu@intel.com>