[postgis-tickets] [PostGIS] #3786: OSS FUZZ fixes

[PostGIS]

#3786: OSS FUZZ fixes
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  Reporter:  robe     |      Owner:  pramsey
      Type:  defect   |     Status:  new
  Priority:  medium   |  Milestone:  PostGIS 2.4.0
 Component:  postgis  |    Version:  trunk
Resolution:           |   Keywords:
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Comment (by strk):

 The return from that function is an object *pointer* so 0 means NULL
 pointer.
 What happens upon calling lwerror depends on the error handler
 installed. PostGIS installs an handler that interrupts the flow, but
 other clients (unit tests, fuzzers, foreign clients when allowed) are
 free to install an handler that continues execution, so it is
 important not to assume loss of flow on error.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/3786#comment:3>
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