[PostGIS] #5794: Crash with TopoGeo_addPoint

[PostGIS]

#5794: Crash with TopoGeo_addPoint
----------------------+---------------------------
 Reporter:  strk      |      Owner:  strk
     Type:  defect    |     Status:  new
 Priority:  blocker   |  Milestone:  PostGIS 3.5.1
Component:  topology  |    Version:  3.4.x
 Keywords:  crash     |
----------------------+---------------------------
 Testcase:
 {{{
 SELECT NULL FROM topology.CreateTopology ('topo');
 SELECT NULL FROM topology.TopoGeo_addLinestring('topo', 'LINESTRING(0 0,
 10 0)');
 SELECT NULL FROM topology.TopoGeo_addPoint('topo', 'POINT(9 5)', 5);
 }}}

 PostGIS-3.4 is not affected, crashers are from 3.5 onward. Must be the
 experimental code doing edge merges.
-- 
Ticket URL: <https://trac.osgeo.org/postgis/ticket/5794>
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