[PATCH] repository: fix free problem with repo_clear(the_repository)

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

the_repository is special. One of the special things about it is that
it does not allocate a new index_state object like submodules but
points to the global the_index variable instead. As a global variable,
the_index cannot be free()'d.

Add an exception for this in repo_clear(). In the future perhaps we
would be able to allocate the_repository's index on heap too. Then we
can remove revert this.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 I was trying to test the new parsed_object_pool_clear() and found this.

 repository.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/repository.c b/repository.c
index a4848c1bd0..f44733524a 100644
--- a/repository.c
+++ b/repository.c
@@ -238,7 +238,9 @@ void repo_clear(struct repository *repo)
 
 	if (repo->index) {
 		discard_index(repo->index);
-		FREE_AND_NULL(repo->index);
+		if (repo->index != &the_index)
+			free(repo->index);
+		repo->index = NULL;
 	}
 }
 
-- 
2.17.0.705.g3525833791