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libttf: check directory() result

--- a/sys/src/libttf/head.c

+++ b/sys/src/libttf/head.c

@@ -292,7 +292,7 @@

 		return nil;

 	u->bin = b;

 	u->nkern = -1;

-	directory(u);

+	if(directory(u) < 0) goto error;

 	if(ttfgototable(u, "head") < 0) goto error;

 	ttfunpack(u, "16 w W 16 wwww 6 w", &u->flags, &u->emsize, &u->xmin, &u->ymin, &u->xmax, &u->ymax, &u->longloca);

 	if(ttfgototable(u, "maxp") < 0) goto error;