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[svg] Clear correct flags for doc ownership

Ben Wagner requested to merge bungeman/freetype:svg_clear_correct_ownership_flag into master

This issue was discovered with an SVG based font with some documents compressed and other uncompressed. After loading the first compressed document the ownership flag on the glyph slot was set to true but never set to false. As a result after loading a compressed document a glyph from an uncompressed document would load fine, but when this glyph slot was cleared it would try to free its document resulting in a wild free.

  • src/base/ftobjs.c (ft_glyphslot_clear): clear correct flags

Fixes: #1162 (closed)

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