[PATCH v2] commit-graph: Fix missing closedir in expire_commit_graphs

The function calls opendir() but missing the corresponding
closedir() before exit the function.
Add missing closedir() to fix it.

Signed-off-by: Miaoqian Lin <redacted>
---
changes in v2:
- add if (dir) before closedir(), as suggested by Derrick.
---
 commit-graph.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/commit-graph.c b/commit-graph.c
index 06f7d9e0b6af..a7d875593288 100644
--- a/commit-graph.c
+++ b/commit-graph.c

@@ -2265,6 +2265,8 @@ static void expire_commit_graphs(struct write_commit_graph_context *ctx)
 	}
 
 out:
+	if(dir)
+		closedir(dir);
 	strbuf_release(&path);
 }
 

-- 
2.25.1