graph.c: infinite loop in git whatchanged --graph -m

Running "whatchanged --graph -m" on a simple two-head merges
can fall into infinite loop.

Signed-off-by: Michał Kiedrowicz <michal.kiedrowicz@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/graph.c b/graph.c
index 7e0a099f83..d92868ba12 100644
--- a/graph.c
+++ b/graph.c
@@ -1199,7 +1199,7 @@ void graph_show_commit(struct git_graph *graph)
 	if (!graph)
 		return;
 
-	while (!shown_commit_line) {
+	while (!shown_commit_line && !graph_is_commit_finished(graph)) {
 		shown_commit_line = graph_next_line(graph, &msgbuf);
 		fwrite(msgbuf.buf, sizeof(char), msgbuf.len, stdout);
 		if (!shown_commit_line)