refs.c: make get_main_ref_store() public and use it

diff --git a/refs/files-backend.c b/refs/files-backend.c
index 9676cd32e41a14bafa90921fea9f805de47f9c2e..b62f374f9ce0b3bb9bc85e75d99d9ca83a51ad9a 100644 (file)
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -3163,7 +3163,7 @@ int set_worktree_head_symref(const char *gitdir, const char *target, const char
         * backends. This function needs to die.
         */
        struct files_ref_store *refs =
-               files_downcast(get_ref_store(NULL), 0, "set_head_symref");
+               files_downcast(get_main_ref_store(), 0, "set_head_symref");
 
        static struct lock_file head_lock;
        struct ref_lock *lock;