XS.xs: Avoid stealing in like helper
XS.xs: Avoid stealing in like helper

Do not risk stealing from a mortal SV when doing a check on it.

Signed-off-by: Jens Rehsack <69d49c504a9219a55b8be0f905e8fe3c32ffb57f@netbsd.org>

perl5-utils/List-MoreUtils-XS,perl5-utils/List-MoreUtils-XS