refs.c: remove lock_ref_sha1

lock_ref_sha1 was only called from one place in refs.c and only provided
a check that the refname was sane before adding back the initial "refs/"
part of the ref path name, the initial "refs/" that this caller had already
stripped off before calling lock_ref_sha1.

Signed-off-by: Ronnie Sahlberg <sahlberg@google.com>
Reviewed-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

refs.c

@@ -2173,15 +2173,6 @@ static struct ref_lock *lock_ref_sha1_basic(const char *refname,
 	return NULL;
 }
 
-static struct ref_lock *lock_ref_sha1(const char *refname, const unsigned char *old_sha1)
-{
-	char refpath[PATH_MAX];
-	if (check_refname_format(refname, 0))
-		return NULL;
-	strcpy(refpath, mkpath("refs/%s", refname));
-	return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL);
-}
-
 struct ref_lock *lock_any_ref_for_update(const char *refname,
 					 const unsigned char *old_sha1,
 					 int flags, int *type_p)
@@ -2391,8 +2382,12 @@ static void try_remove_empty_parents(char *name)
 /* make sure nobody touched the ref, and unlink */
 static void prune_ref(struct ref_to_prune *r)
 {
-	struct ref_lock *lock = lock_ref_sha1(r->name + 5, r->sha1);
+	struct ref_lock *lock;
+
+	if (check_refname_format(r->name + 5, 0))
+		return;
 
+	lock = lock_ref_sha1_basic(r->name, r->sha1, 0, NULL);
 	if (lock) {
 		unlink_or_warn(git_path("%s", r->name));
 		unlock_ref(lock);