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font: unmap glyphs with .fmap

If the second argument of .fmap is not a glyph name, the character
specified as the first argument is unmapped.

--- a/font.c

+++ b/font.c

@@ -55,7 +55,7 @@

 struct glyph *font_find(struct font *fn, char *name)

 {

 	int i = dict_get(fn->ch_map, name);

-	if (i < 0)

+	if (i == -1)		/* -2 means the glyph has been unmapped */

 		i = dict_get(fn->ch_dict, name);

 	return i >= 0 ? fn->gl + i : NULL;

 }