isl_coalesce.c: wrap_in_facets: avoid invalid access on error path
isl_coalesce.c: wrap_in_facets: avoid invalid access on error path

The wraps variable has not yet been initialized at this point and
is freed from the error label.  Simply return instead.
The problem was introduced in 239513e (isl_map_coalesce: optionally bound
the coefficients of wrapping constraints, Wed Apr 11 10:54:37 2012 +0200).

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

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