* src/cff/cf2font.c (cf2_computeDarkening): Initialize darkenAmount. This line was lost in commit 89ca1fd6 (from 2013-06-25). The effect is to use a previous darkening amount when producing an unhinted, unscaled outline. This can cause autohint samples in ftgrid and ftview to be based on darkened CFF outlines instead of unhinted, undarkened ones.