PVS/V751: tui.c, Parameter is not used

False positive. Documentation for grid_scroll says "`cols` is always
zero, reserved for future use".

src/nvim/tui/tui.c

@@ -1052,6 +1052,7 @@ static void tui_grid_scroll(UI *ui, Integer g, Integer startrow, Integer endrow,
                             Integer startcol, Integer endcol,
                             Integer rows, Integer cols)
 {
+  (void)cols;  // unused
   TUIData *data = ui->data;
   UGrid *grid = &data->grid;
   int top = (int)startrow, bot = (int)endrow-1;