isl_vertices.c: vertices_0D: drop unused variable
isl_vertices.c: vertices_0D: drop unused variable

Detected by a scan_build on Polly.

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

Distrotech/isl,nicolasvasilache/isl,abduld/isl,BenzoSM/isl,KangDroidSMProject/ISL,BenzoSM/isl,nicolasvasilache/isl,simbuerg/isl,PollyLabs/isl,UBERTC/isl,tobig/isl,SaberMod/isl-current,UBERTC/isl,BenzoSM/isl,evaautomation/isl,Meinersbur/isl,UBERTC/isl,simbuerg/isl,inducer/isl-mirror,SaberMod/isl-current,evaautomation/isl,inducer/isl-mirror,PollyLabs/isl,Meinersbur/isl,SaberMod/isl-current,simbuerg/isl,nicolasvasilache/isl,KangDroidSMProject/ISL,UBERTC/isl,simbuerg/isl,BenzoSM/isl,nicolasvasilache/isl,KangDroidSMProject/ISL,tobig/isl,KangDroidSMProject/ISL,BenzoSM/isl,abduld/isl,PollyLabs/isl,SaberMod/isl-current,KangDroidSMProject/ISL,inducer/isl-mirror,Distrotech/isl,Meinersbur/isl,PollyLabs/isl,inducer/isl-mirror,tobig/isl,tobig/isl,Distrotech/isl,PollyLabs/isl,evaautomation/isl,simbuerg/isl,evaautomation/isl,Distrotech/isl,abduld/isl,abduld/isl,inducer/isl-mirror,Distrotech/isl,Meinersbur/isl,nicolasvasilache/isl