[PostGIS] #5976: GML input function crashes on 3.5.3--3.6.0dev upgrade

[PostGIS]

#5976: GML input function crashes on 3.5.3--3.6.0dev upgrade
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  Reporter:  strk     |      Owner:  pramsey
      Type:  defect   |     Status:  new
  Priority:  blocker  |  Milestone:  PostGIS 3.6.0
 Component:  postgis  |    Version:  3.6.x
Resolution:           |   Keywords:
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Comment (by strk):

 Same crash when upgrading from 3.4.5dev:
 {{{
 ../../regress/run_test.pl --extension --upgrade --upgrade-path 3.4.5dev--
 3.6.0dev -v ../../regress/core/in_gml.sql
 xlink_20|GEOMETRYCOLLECTION(MULTIPOLYGON(((1 2,3 4,5 6,1
 2))),MULTIPOLYGON(((1 2,3 4,5 6,1 2))))
 xlink_21|GEOMETRYCOLLECTION(MULTIPOLYGON(((1 2,3 4,5 6,1
 2))),MULTIPOLYGON(((1 2,3 4,5 6,1 2))))
 xlink_22|GEOMETRYCOLLECTION(GEOMETRYCOLLECTION(POINT(1
 2)),GEOMETRYCOLLECTION(POINT(1 2)))
 psql:in_gml.sql:997: ERROR:  invalid GML representation
 psql:in_gml.sql:1000: server closed the connection unexpectedly
         This probably means the server terminated abnormally
         before or while processing the request.
 psql:in_gml.sql:1000: error: connection to server was lost
 }}}
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5976#comment:2>
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