[postgis-tickets] [PostGIS] #3847: Apply Coverity "high" fixes

[PostGIS]

#3847: Apply Coverity "high" fixes
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 Reporter:  pramsey  |      Owner:  pramsey
     Type:  defect   |     Status:  new
 Priority:  high     |  Milestone:  PostGIS 2.4.0
Component:  postgis  |    Version:  trunk
 Keywords:           |
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 As run (Stephen Frost) and diagnosed (Adam Brightwell) by CrunchData
 Solutions team.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/3847>
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