patch 8.0.0330: illegal memory access after "vapo"

Problem:    Illegal memory access after "vapo". (Dominique Pelle)
Solution:   Fix the cursor column.

src/search.c

@@ -4241,7 +4241,11 @@ extend:
 	 * line, we get stuck there.  Trap this here. */
 	if (VIsual_mode == 'V' && start_lnum == curwin->w_cursor.lnum)
 	    goto extend;
+	if (VIsual.lnum != start_lnum)
+	{
 	    VIsual.lnum = start_lnum;
+	    VIsual.col = 0;
+	}
 	VIsual_mode = 'V';
 	redraw_curbuf_later(INVERTED);	/* update the inversion */
 	showmode();

src/testdir/test_visual.vim

@@ -36,3 +36,10 @@ func Test_Visual_ctrl_o()
   set tw&
   bw!
 endfu
+
+func Test_Visual_vapo()
+  new
+  normal oxx
+  normal vapo
+  bwipe!
+endfunc

src/version.c

@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    330,
 /**/
     329,
 /**/