isl_map_align_divs: fix error handling
isl_map_align_divs: fix error handling

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

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