updated for version 7.4.491

Problem:    When winrestview() has a negative "topline" value there are
	    display errors.
Solution:   Correct a negative value to 1. (Hirohito Higashi)

src/eval.c

@@ -19576,7 +19576,7 @@ f_winrestview(argvars, rettv)
 # endif
 	changed_window_setting();
 
-	if (curwin->w_topline == 0)
+	if (curwin->w_topline <= 0)
 	    curwin->w_topline = 1;
 	if (curwin->w_topline > curbuf->b_ml.ml_line_count)
 	    curwin->w_topline = curbuf->b_ml.ml_line_count;

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    491,
 /**/
     490,
 /**/