Minor renamings of internal inline functions
diff --git a/src/hb-ot-shape.cc b/src/hb-ot-shape.cc
index 36e0bf9..1189b20 100644
--- a/src/hb-ot-shape.cc
+++ b/src/hb-ot-shape.cc
@@ -829,12 +829,12 @@
 {
   c->buffer->deallocate_var_all ();
   c->buffer->scratch_flags = HB_BUFFER_SCRATCH_FLAG_DEFAULT;
-  if (likely (!_hb_unsigned_int_mul_overflows (c->buffer->len, HB_BUFFER_MAX_LEN_FACTOR)))
+  if (likely (!hb_unsigned_mul_overflows (c->buffer->len, HB_BUFFER_MAX_LEN_FACTOR)))
   {
     c->buffer->max_len = MAX (c->buffer->len * HB_BUFFER_MAX_LEN_FACTOR,
 			      (unsigned) HB_BUFFER_MAX_LEN_MIN);
   }
-  if (likely (!_hb_unsigned_int_mul_overflows (c->buffer->len, HB_BUFFER_MAX_OPS_FACTOR)))
+  if (likely (!hb_unsigned_mul_overflows (c->buffer->len, HB_BUFFER_MAX_OPS_FACTOR)))
   {
     c->buffer->max_ops = MAX (c->buffer->len * HB_BUFFER_MAX_OPS_FACTOR,
 			      (unsigned) HB_BUFFER_MAX_OPS_MIN);