isl_flow.c: access_info_compute_flow_core: plug memory leak on error path
isl_flow.c: access_info_compute_flow_core: plug memory leak on error path

The leak was introduced in 22acb5a (isl_access_info_compute_flow:
extract out access_info_compute_flow_core, Sat Oct 31 11:18:09 2015 +0100).

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

PollyLabs/isl,BenzoSM/isl,inducer/isl-mirror,PollyLabs/isl,inducer/isl-mirror,tobig/isl,UBERTC/isl,Distrotech/isl,BenzoSM/isl,UBERTC/isl,PollyLabs/isl,nicolasvasilache/isl,inducer/isl-mirror,Distrotech/isl,UBERTC/isl,BenzoSM/isl,tobig/isl,BenzoSM/isl,Distrotech/isl,inducer/isl-mirror,BenzoSM/isl,nicolasvasilache/isl,nicolasvasilache/isl,Meinersbur/isl,tobig/isl,Meinersbur/isl,UBERTC/isl,Distrotech/isl,nicolasvasilache/isl,Meinersbur/isl,Distrotech/isl,inducer/isl-mirror,tobig/isl,Meinersbur/isl,PollyLabs/isl,PollyLabs/isl,nicolasvasilache/isl