git: update to v2.13.4

Update to git version v2.13.4: With commit 8aee769f (pathspec: copy and free
owned memory) the definition of struct pathspec_item has changed with the
expectation that pathspecs will be managed dynamically. We work around this
a bit by setting up a static structure, but let's allocate the match string
to avoid needing to cast away const.

Updated a patch from John Keeping <john@keeping.me.uk> for git v2.12.1.

1 files changed, 6 insertions, 3 deletions

diff --git a/ui-blob.c b/ui-blob.c
index 5f30de7..793817f 100644
--- a/ui-blob.c
+++ b/ui-blob.c
@@ -38,7 +38,7 @@ int cgit_ref_path_exists(const char *path, const char *ref, int file_only)
         struct object_id oid;
         unsigned long size;
         struct pathspec_item path_items = {
-                .match = path,
+                .match = xstrdup(path),
                 .len = strlen(path)
         };
         struct pathspec paths = {
@@ -53,10 +53,13 @@ int cgit_ref_path_exists(const char *path, const char *ref, int file_only)
         };
 
         if (get_oid(ref, &oid))
-                return 0;
+                goto done;
         if (sha1_object_info(oid.hash, &size) != OBJ_COMMIT)
-                return 0;
+                goto done;
         read_tree_recursive(lookup_commit_reference(oid.hash)->tree, "", 0, 0, &paths, walk_tree, &walk_tree_ctx);
+
+done:
+        free(path_items.match);
         return walk_tree_ctx.found_path;
 }