isl_map.c: set_parameter_preimage: do not drop isl_set_reset_space return value
isl_map.c: set_parameter_preimage: do not drop isl_set_reset_space return value

Ignoring the return value is unlikely to cause any problems since
the input is newly created and should therefore not have any copies.
However, technically, it is still incorrect.

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

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