isl_space_*_factor_*: fix typo in code
isl_space_*_factor_*: fix typo in code

The variable used has the same value as the correct variable,
but we should just use the correct variable.

Detected by a scan_build on Polly.

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

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