isl_map_project_out: fix error return value
isl_map_project_out: fix error return value

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