[PATCH 1/2] refs: remove unused head_ref_submodule() implementation

commit 990eaca068 ("refs: remove dead for_each_*_submodule()",
18-03-2017) removed the public declaration of head_ref_submodule(), but
forgot to remove the definition.

Signed-off-by: Ramsay Jones <redacted>
---

Hi Duy,

If you need to re-roll your 'nd/prune-in-worktree' branch, could you please
squash this into the relevant patch.

Also, I note that this patch does not update the technical documentation to
remove references to these api functions. (see Documentation/technical/\
api-ref-iteration.txt).

Thanks!

ATB,
Ramsay Jones

 refs.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/refs.c b/refs.c
index 6006d4fdb..e80425379 100644
--- a/refs.c
+++ b/refs.c

@@ -1208,11 +1208,6 @@ int refs_head_ref(struct ref_store *refs, each_ref_fn fn, void *cb_data)
 	return 0;
 }
 
-int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
-{
-	return refs_head_ref(get_submodule_ref_store(submodule), fn, cb_data);
-}
-
 int head_ref(each_ref_fn fn, void *cb_data)
 {
 	return refs_head_ref(get_main_ref_store(), fn, cb_data);

-- 
2.12.0