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otf: use delta even if offset is nonzero in cmap format 4

Reported by Dirk-Wilhelm Peters <peters@schwertfisch.de>.

--- a/otf.c

+++ b/otf.c

@@ -85,8 +85,8 @@

 		offset = U16(offsets, 2 * i);

 		if (offset) {

 			for (j = beg; j <= end; j++)

-				glyph_code[U16(offsets,

-						offset + (j - beg) * 2)] = j;

+				glyph_code[(U16(offsets + 2 * i,

+					offset + (j - beg) * 2) + delta) & 0xffff] = j;

 		} else {

 			for (j = beg; j <= end; j++)

 				glyph_code[(j + delta) & 0xffff] = j;