[patch] When specify a negative number to 'topline' by winrestview(), display becomes strange.

[h_east]

Hi list!

How to reproduce:
- start vim
  $ vim -N -u NONE -c "se nu"

- Input below.
  ia<Esc>
  :call winrestview({'topline': -3})


Expected behavior:
- Display this. (Display does not change)
  1 a

Actual behavior:
- Displayed below. (Invalid line number!)
 -3 a
 -2 a
 -1 a
  0 a
  1 a

I attached a patch.
Please check this.

--
Best regards,
Hirohito Higashi

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diff -r 47b1887483da src/eval.c
--- a/src/eval.c	Fri Sep 19 22:38:48 2014 +0200
+++ b/src/eval.c	Tue Sep 23 23:21:47 2014 +0900
@@ -19576,7 +19576,7 @@
 # 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;