[PostGIS] #5794: Crash with TopoGeo_addPoint

[PostGIS]

#5794: Crash with TopoGeo_addPoint
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  Reporter:  strk      |      Owner:  strk
      Type:  defect    |     Status:  new
  Priority:  blocker   |  Milestone:  PostGIS 3.5.1
 Component:  topology  |    Version:  3.4.x
Resolution:            |   Keywords:  crash
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Comment (by strk):

 The use of uninitialized value of size 8 reported by valgrind ALSO occurs
 with PostGIS-3.4 but doesn't bring to a segfault later.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5794#comment:2>
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