Fix raster regression on Raspberry Pi.
A signed NODATA value was assigned to unsigned variable. On Intel that was reversible, on ARM and PPC it replaced all negatives with 0. Thanks to Alina Dolgikh for supporting me: https://www.patreon.com/komzpa Closes #4102 Closes https://github.com/postgis/postgis/pull/276 git-svn-id: http://svn.osgeo.org/postgis/trunk@16661 b70326c6-7e19-0410-871a-916f4a2858ee
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