[PATCH 2 of 4 V2] sparse-revlog: handle nullrev in index_get_start

[Yuya Nishihara]

On Sat, 15 Dec 2018 15:10:54 +0000, Boris Feld wrote:
> # HG changeset patch
> # User Boris Feld <boris.feld at octobus.net>
> # Date 1544804621 -3600
> #      Fri Dec 14 17:23:41 2018 +0100
> # Node ID 216e6d5c773cd51c18e351b11a8105165d2ad2d7
> # Parent  c1e47daaab82e7d9340b0bd179d022fdd21062fc
> # EXP-Topic sparse-followup
> # Available At https://bitbucket.org/octobus/mercurial-devel/
> #              hg pull https://bitbucket.org/octobus/mercurial-devel/ -r 216e6d5c773c
> sparse-revlog: handle nullrev in index_get_start
> 
> The more generic index_get method handle nullrev fine, we apply the same logic
> here.
> 
> diff --git a/mercurial/cext/revlog.c b/mercurial/cext/revlog.c
> --- a/mercurial/cext/revlog.c
> +++ b/mercurial/cext/revlog.c
> @@ -190,6 +190,9 @@ static inline int index_get_parents(inde
>  
>  static inline int64_t index_get_start(indexObject *self, Py_ssize_t rev)
>  {
> +	if (rev == nullrev) {
> +		return 0;
> +	}
>  	uint64_t offset;

Moved the declaration to top.