isl_tab_pip.c: set_minimum: drop unused variable
isl_tab_pip.c: set_minimum: drop unused variable

Detected by a scan_build on Polly.

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

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