isl_tab_pip.c: sol_pop: avoid invalid access on error
isl_tab_pip.c: sol_pop: avoid invalid access on error

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

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