[kerx] Port to hb_sanitize_with_object_t

src/hb-aat-layout-kerx-table.hh

@@ -926,13 +926,11 @@ struct KerxTable
       if (reverse)
 	c->buffer->reverse ();
 
-      /* See comment in sanitize() for conditional here. */
-      if (i < count - 1)
-	c->sanitizer.set_object (st);
-      else
-	c->sanitizer.set_object ();
-
-      ret |= st->dispatch (c);
+      {
+	/* See comment in sanitize() for conditional here. */
+	hb_sanitize_with_object_t with (&c->sanitizer, i < count - 1 ? st : (const SubTable *) nullptr);
+	ret |= st->dispatch (c);
+      }
 
       if (reverse)
 	c->buffer->reverse ();
@@ -943,7 +941,6 @@ struct KerxTable
       st = &StructAfter<SubTable> (*st);
       c->set_lookup_index (c->lookup_index + 1);
     }
-    c->sanitizer.set_object ();
 
     return ret;
   }
@@ -962,7 +959,6 @@ struct KerxTable
     unsigned int count = thiz()->tableCount;
     for (unsigned int i = 0; i < count; i++)
     {
-      c->set_object ();
       if (unlikely (!st->u.header.sanitize (c)))
 	return_trace (false);
       /* OpenType kern table has 2-byte subtable lengths.  That's limiting.
@@ -972,14 +968,13 @@ struct KerxTable
        * is simply ignored.  Which makes sense.  It's only needed if you
        * have multiple subtables.  To handle such fonts, we just ignore
        * the length for the last subtable. */
-      if (i < count - 1)
-	c->set_object (st);
+      hb_sanitize_with_object_t with (c, i < count - 1 ? st : (const SubTable *) nullptr);
 
       if (unlikely (!st->sanitize (c)))
 	return_trace (false);
+
       st = &StructAfter<SubTable> (*st);
     }
-    c->set_object ();
 
     return_trace (true);
   }