"color diff-header cyan default" doesn't appear to work

[mbsulliv]

When I add the line "color diff-header cyan default" (without the quotes) to my ~/.tigrc file, it doesn't change the color of diff header lines (i.e. lines that start with "diff --git "). I built from d59840e which is the HEAD on master at the moment.

[jonas]

According to color(3NCURSES) the first argument must be >= 1, which was not the case. Should be fixed by the latest commit.