copy advance after FT_Done_Glyph

[Ryan Martindale]

I haven't tried it, but just looking at the code in src/base/ftglyph.c, at
line 829, it would seem that calling FT_Done_Glyph(glyph) before copying the
advance as shown below would be bad (freeing memory, then using it again).

      if ( destroy )
        FT_Done_Glyph( glyph );

      /* copy advance - thanks Karsten ;-) */
      bitmap->root.advance = glyph->advance;

Thanks,
Ryan Martindale