unlock_ref(): move definition higher in the file

This avoids the need for a forward declaration in the next patch.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>

refs/files-backend.c

@@ -1516,6 +1516,16 @@ out:
 	return ret;
 }
 
+static void unlock_ref(struct ref_lock *lock)
+{
+	/* Do not free lock->lk -- atexit() still looks at them */
+	if (lock->lk)
+		rollback_lock_file(lock->lk);
+	free(lock->ref_name);
+	free(lock->orig_ref_name);
+	free(lock);
+}
+
 /*
  * Peel the entry (if possible) and return its new peel_status.  If
  * repeel is true, re-peel the entry even if there is an old peeled
@@ -1674,16 +1684,6 @@ int do_for_each_ref(const char *submodule, const char *base,
 	return do_for_each_entry(refs, base, do_one_ref, &data);
 }
 
-static void unlock_ref(struct ref_lock *lock)
-{
-	/* Do not free lock->lk -- atexit() still looks at them */
-	if (lock->lk)
-		rollback_lock_file(lock->lk);
-	free(lock->ref_name);
-	free(lock->orig_ref_name);
-	free(lock);
-}
-
 /*
  * Verify that the reference locked by lock has the value old_sha1.
  * Fail if the reference doesn't exist and mustexist is set. Return 0