patchtest_bitmap_walk: free bitmap with bitmap_free

> Commit f86a374 (pack-bitmap.c: fix a memleak, 2015-03-30)
> noticed that we leak the "result" bitmap. But we should use
> "bitmap_free" rather than straight "free", as the former
> remembers to free the bitmap array pointed to by the struct.
>
> Signed-off-by: Jeff King <peff@peff.net>
> ---
> Sorry, I should have noticed this when reviewing the original.

>
>  pack-bitmap.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/pack-bitmap.c b/pack-bitmap.c
> index 62a98cc..d64bd94 100644
> --- a/pack-bitmap.c
> +++ b/pack-bitmap.c
> @@ -987,7 +987,7 @@ void test_bitmap_walk(struct rev_info *revs)
>         else
>                 fprintf(stderr, "Mismatch!\n");
>
> -       free(result);
> +       bitmap_free(result);
>  }
>
>  static int rebuild_bitmap(uint32_t *reposition,
> --
> 2.4.1.528.g00591e3