pack-bitmap: add free function

Add a function to free struct bitmap_index instances, and use it where
needed (except when rebuild_existing_bitmaps() is used, since it creates
references to the bitmaps within the struct bitmap_index passed to it).

Note that the hashes field in struct bitmap_index is not freed because
it points to another field within the same struct. The documentation for
that field has been updated to clarify that.

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/builtin/pack-objects.c b/builtin/pack-objects.c
index d064f944b0..896e413007 100644
--- a/builtin/pack-objects.c
+++ b/builtin/pack-objects.c
@@ -2945,6 +2945,7 @@ static int get_object_list_from_bitmap(struct rev_info *revs)
 	}
 
 	traverse_bitmap_commit_list(bitmap_git, &add_object_entry_from_bitmap);
+	free_bitmap_index(bitmap_git);
 	return 0;
 }