isl_aff.c: fix typo in comment
isl_aff.c: fix typo in comment

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

Distrotech/isl,BenzoSM/isl,BenzoSM/isl,serge-sans-paille/isl,epowers/isl,KangDroidSMProject/ISL,Distrotech/isl,jleben/isl,serge-sans-paille/isl,inducer/isl-mirror,PollyLabs/isl,BenzoSM/isl,UBERTC/isl,BenzoSM/isl,pierrotdelalune/isl,cfx-next/toolchain_isl-upstream,abduld/isl,cfx-next/toolchain_isl-upstream,crossbuild/isl,BobSaget-Mod/libisl,Distrotech/isl,evaautomation/isl,SaberMod/isl-current,BenzoSM/isl,BobSaget-Mod/libisl,cfx-next/toolchain_isl-upstream,nicolasvasilache/isl,VanirLLVM/toolchain_isl,jleben/isl,serge-sans-paille/isl,epowers/isl,pierrotdelalune/isl,jleben/isl,nicolasvasilache/isl,abduld/isl,crossbuild/isl,Meinersbur/isl,simbuerg/isl,UBERTC/isl,BobSaget-Mod/libisl,KangDroidSMProject/ISL,VanirLLVM/toolchain_isl,cfx-next/toolchain_isl-upstream,evaautomation/isl,abduld/isl,crossbuild/isl,Meinersbur/isl,Distrotech/isl,nicolasvasilache/isl,jleben/isl,cfx-next/toolchain_isl-upstream,inducer/isl-mirror,tobig/isl,nicolasvasilache/isl,SaberMod/isl-current,tobig/isl,SaberMod/isl-current,VanirLLVM/toolchain_isl,UBERTC/isl,serge-sans-paille/isl,Distrotech/isl,tobig/isl,BobSaget-Mod/libisl,PollyLabs/isl,epowers/isl,KangDroidSMProject/ISL,tobig/isl,KangDroidSMProject/ISL,PollyLabs/isl,VanirLLVM/toolchain_isl,PollyLabs/isl,UBERTC/isl,pierrotdelalune/isl,Meinersbur/isl,simbuerg/isl,evaautomation/isl,simbuerg/isl,inducer/isl-mirror,crossbuild/isl,epowers/isl,simbuerg/isl,SaberMod/isl-current,evaautomation/isl,BobSaget-Mod/libisl,PollyLabs/isl,pierrotdelalune/isl,VanirLLVM/toolchain_isl,pierrotdelalune/isl,nicolasvasilache/isl,jleben/isl,inducer/isl-mirror,abduld/isl,serge-sans-paille/isl,Meinersbur/isl,epowers/isl,inducer/isl-mirror,simbuerg/isl,KangDroidSMProject/ISL