isl_input_omega.c: fix check for memory allocation error
isl_input_omega.c: fix check for memory allocation error

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