refs_verify_refname_available(): implement once for all backends

It turns out that we can now implement
`refs_verify_refname_available()` based on the other virtual
functions, so there is no need for it to be defined at the backend
level. Instead, define it once in `refs.c` and remove the
`files_backend` definition.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/refs.h b/refs.h
index 49e97d7d5f..07cf4cd41b 100644
--- a/refs.h
+++ b/refs.h
@@ -97,7 +97,7 @@ int read_ref(const char *refname, unsigned char *sha1);
 
 int refs_verify_refname_available(struct ref_store *refs,
 				  const char *refname,
-				  const struct string_list *extra,
+				  const struct string_list *extras,
 				  const struct string_list *skip,
 				  struct strbuf *err);