src/xdisp.c (init_iterator): Restore a comment lost in transition.

src/ChangeLog

+2015-01-22  Eli Zaretskii  <eliz@gnu.org>
+
+	* xdisp.c (init_iterator): Restore a comment lost in transition.
+
 2015-01-22  Paul Eggert  <eggert@cs.ucla.edu>
 	Use bool for boolean in xfont.c, xftfont.c, xgselect.c

src/xdisp.c

@@ -2746,6 +2746,8 @@ init_iterator (struct it *it, struct window *w,
 	row = MATRIX_HEADER_LINE_ROW (w->desired_matrix);
     }
+  /* Clear IT, and set it->object and other IT's Lisp objects to Qnil.
+     Other parts of redisplay rely on that.  */
   memclear (it, sizeof *it);
   it->current.overlay_string_index = -1;
   it->current.dpvec_index = -1;