[PATCH] vinyl: fix memory leak in write iterator

[Vladimir Davydov]

Pushed to 1.10 as trivial.

On Thu, Oct 25, 2018 at 12:00:13PM +0300, Vladimir Davydov wrote:
> Memory allocated for vy_write_iterator::src_heap is never freed. Fix it.
> The leak was introduced by commit c174c985485c ("vinyl: implement new
> simple write iterator").
> ---
> https://github.com/tarantool/tarantool/commits/dv/vy-fix-memleak-in-write-iterator
> 
>  src/box/vy_write_iterator.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/src/box/vy_write_iterator.c b/src/box/vy_write_iterator.c
> index 1b54e539..2fa66bd7 100644
> --- a/src/box/vy_write_iterator.c
> +++ b/src/box/vy_write_iterator.c
> @@ -443,6 +443,7 @@ vy_write_iterator_close(struct vy_stmt_stream *vstream)
>  	assert(vstream->iface->close == vy_write_iterator_close);
>  	struct vy_write_iterator *stream = (struct vy_write_iterator *)vstream;
>  	vy_write_iterator_stop(vstream);
> +	vy_source_heap_destroy(&stream->src_heap);
>  	tuple_format_unref(stream->format);
>  	free(stream);
>  }