isl_list_templ.c: fix harmless typo in code
isl_list_templ.c: fix harmless typo in code

The FN macro is meant to construct the name of a function,
so use it that way.

Signed-off-by: Sven Verdoolaege <e5350bbed4977f5eb8ae1dc6abd9ae59d21ace75@kotnet.org>

tobig/isl,Meinersbur/isl,tobig/isl,Meinersbur/isl,Meinersbur/isl,nicolasvasilache/isl,inducer/isl-mirror,inducer/isl-mirror,nicolasvasilache/isl,tobig/isl,tobig/isl,inducer/isl-mirror,Meinersbur/isl,PollyLabs/isl,nicolasvasilache/isl,nicolasvasilache/isl,PollyLabs/isl,nicolasvasilache/isl,PollyLabs/isl,PollyLabs/isl,inducer/isl-mirror,inducer/isl-mirror,PollyLabs/isl