REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4377 Fix below warnings generated by NASM X64 build: /X64/FspHelper.iii:26: warning: signed dword value exceeds bounds /X64/FspHelper.iii:35: warning: signed dword value exceeds bounds /X64/FspApiEntryT.iii:320: warning: dword data exceeds bounds Also replaced "cmp reg, 0" with "test reg, reg" per optimization suggestion. Cc: Nate DeSimone <nathaniel.l.desimone@intel.com> Cc: Star Zeng <star.zeng@intel.com> Signed-off-by: Chasel Chiu <chasel.chiu@intel.com> Reviewed-by: Nate DeSimone <nathaniel.l.desimone@intel.com>