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TGA Plugin: Fix reading of CMapDepth

Andreas Sturmlechner requested to merge asturmlechner/qtimageformats:tga-plugin-oss-fuzz-50741 into kde/5.15

It's specified to be one byte but the old code used to read an int of two bytes. Maybe this wasn't noticed because the following byte often has a value of zero.

This fixes oss-fuzz issue 50741 which is an integer overflow resulting from the too large value.

[ChangeLog] Fixed reading of TGA files with a non-zero X-origin

Pick-to: 6.5 6.4 6.2 5.15 Change-Id: I989bffd0e4e03caf6737e1ce085247ed54e40db0 Reviewed-by: Eirik Aavitsland eirik.aavitsland@qt.io Reviewed-by: Qt CI Bot qt_ci_bot@qt-project.org Reviewed-by: Robert Löhning robert.loehning@qt.io (cherry picked from commit feb78640)

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