isl_schedule_band.c: has_any: use isl_union_set_every_set
isl_schedule_band.c: has_any: use isl_union_set_every_set

This simplifies the code.

Signed-off-by: Sven Verdoolaege <235c10dd23b819f81cdc9756a251746bc184cab6@gmail.com>

Meinersbur/isl,Meinersbur/isl,Meinersbur/isl,Meinersbur/isl