REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2582 warning C4244: '=': conversion from 'UINTN' to 'UINT32', possible loss of data With this fix, OvmfIa32, OvmfX64 and OvmfIa32X64 can pass build. Cc: Laszlo Ersek <lersek@redhat.com> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Liming Gao <liming.gao@intel.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com>