D16617: fix extraction of GPS altitude for exif data

[Alexander Stippich]

astippich created this revision.
astippich added reviewers: Frameworks, bruns.
Herald added projects: Frameworks, Baloo.
Herald added subscribers: Baloo, kde-frameworks-devel.
astippich requested review of this revision.

REVISION SUMMARY
  The previous code was wrong, since the altitude
  is given with only a single double value
  below or above sea level.

REPOSITORY
  R286 KFileMetaData

BRANCH
  exif_gps_altitude

REVISION DETAIL
  https://phabricator.kde.org/D16617

AFFECTED FILES
  autotests/exiv2extractortest.cpp
  autotests/samplefiles/test.jpg
  src/extractors/exiv2extractor.cpp
  src/extractors/exiv2extractor.h

To: astippich, #frameworks, bruns
Cc: kde-frameworks-devel, #baloo, ashaposhnikov, michaelh, astippich, spoorun, ngraham, bruns, abrahams
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