D16081: Fix build with gpsd 3.18

[Antonio Rojas]

arojas created this revision.
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REVISION SUMMARY
  The signature of gps_read has changed in 3.18 to add an optional buffer parameter.
  Passing NULL, 0 should keep the previous behavior, see https://git.savannah.gnu.org/cgit/gpsd.git/commit?id=6bba8b329fc7687b15863d30471d5af402467802

TEST PLAN
  Builds with gpsd 3.17 and 3.18. Can't test if it works since I don't have a gps device.

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D16081

AFFECTED FILES
  dataengines/geolocation/location_gps.cpp

To: arojas, #plasma
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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