[PATCH 3 of 4 V2] sparse-revlog: handle nullrev in index_get_length

[Boris Feld]

# HG changeset patch
# User Boris Feld <boris.f...@octobus.net>
# Date 1544804684 -3600
#      Fri Dec 14 17:24:44 2018 +0100
# Node ID 36c68746763d6b93b00c19387e79bd9cb623da72
# Parent  216e6d5c773cd51c18e351b11a8105165d2ad2d7
# EXP-Topic sparse-followup
# Available At https://bitbucket.org/octobus/mercurial-devel/
#              hg pull https://bitbucket.org/octobus/mercurial-devel/ -r 
36c68746763d
sparse-revlog: handle nullrev in index_get_length

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
@@ -227,6 +227,9 @@ static inline int64_t index_get_start(in
 
 static inline int index_get_length(indexObject *self, Py_ssize_t rev)
 {
+       if (rev == nullrev) {
+               return 0;
+       }
        if (rev >= self->length) {
                PyObject *tuple;
                PyObject *pylong;
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