label-freetype: Rework font loading

label-freetype: Rework font loading

There's currently this function, set_font_with_fallback, that
almost always gets called with a NULL first argument in the
initramfs, forcing the _with_fallback part of the function to
run.

It's a little strange to have a function with a chunk of code that
hardly ever runs. Furthermore there's a bug where the error variable
is left uninitialized in this case leading to the freetype plugin
sporadically failing to load the fallback font.

This commit reworks things to drop set_font_with_fallback, and just
call FT_New_Face directly in the caller. Fallbacks are handled
at the point where the font path is determined
(previously called query_fc_match, now called find_default_font_path.