More memory errors in GeoJSON input fixed (#2216)

Thanks halset for patch

git-svn-id: http://svn.osgeo.org/postgis/branches/2.0@11122 b70326c6-7e19-0410-871a-916f4a2858ee
Fix memory leak in GeoJSON parser

git-svn-id: http://svn.osgeo.org/postgis/branches/2.0@11123 b70326c6-7e19-0410-871a-916f4a2858ee