[PostGIS] #5558: Compilation warning: uninitialized variable

[PostGIS]

#5558: Compilation warning: uninitialized variable
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  Reporter:  Laurenz Albe  |      Owner:  strk
      Type:  defect        |     Status:  assigned
  Priority:  medium        |  Milestone:  PostGIS 3.4.1
 Component:  postgis       |    Version:  master
Resolution:                |   Keywords:
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Comment (by strk):

 I should note that stable-3.3 is already initializing that flag to 0 which
 was done by paul with [6aa0f6be9f/git]
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5558#comment:6>
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