log: fix memory leak if --graph is passed multiple times

Signed-off-by: Alex Henrie <alexhenrie24@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/graph.h b/graph.h
index 8313e293c7..e88632a014 100644
--- a/graph.h
+++ b/graph.h
@@ -140,6 +140,11 @@ void graph_set_column_colors(const char **colors, unsigned short colors_max);
 struct git_graph *graph_init(struct rev_info *opt);
 
 /*
+ * Free a struct git_graph.
+ */
+void graph_clear(struct git_graph *graph);
+
+/*
  * Update a git_graph with a new commit.
  * This will cause the graph to begin outputting lines for the new commit
  * the next time graph_next_line() is called.