[shape] Remove stray clear_output() call in hb_shape()
diff --git a/src/hb-ot-shape.cc b/src/hb-ot-shape.cc
index b70dece..246936d 100644
--- a/src/hb-ot-shape.cc
+++ b/src/hb-ot-shape.cc
@@ -1158,8 +1158,6 @@
 
   _hb_buffer_allocate_unicode_vars (c->buffer);
 
-  c->buffer->clear_output ();
-
   hb_ot_shape_initialize_masks (c);
   hb_set_unicode_props (c->buffer);
   hb_insert_dotted_circle (c->buffer, c->font);