checkout: fix double-free of checkout_data's mkdir_map

We currently call `git_strmap_free` on `checkout_data.mkdir_map` in the
`checkout_data_clear` function. The only thing protecting us from a
double-free is that the `git_strmap_free` function is in fact not a
function, but a macro that also sets the map to NULL.

Remove the second call to `git_strmap_free` and explicitly set the map
member to NULL.

1 files changed, 1 insertions, 2 deletions

diff --git a/src/checkout.c b/src/checkout.c
index af600da6c..9d1eed59f 100644
--- a/src/checkout.c
+++ b/src/checkout.c
@@ -2319,8 +2319,6 @@ static void checkout_data_clear(checkout_data *data)
 	git__free(data->pfx);
 	data->pfx = NULL;
 
-	git_strmap_free(data->mkdir_map);
-
 	git_buf_free(&data->target_path);
 	git_buf_free(&data->tmp);
 
@@ -2328,6 +2326,7 @@ static void checkout_data_clear(checkout_data *data)
 	data->index = NULL;
 
 	git_strmap_free(data->mkdir_map);
+	data->mkdir_map = NULL;
 
 	git_attr_session__free(&data->attr_session);
 }