lockfile: rename LOCK_NODEREF to LOCK_NO_DEREF

This makes it harder to misread the name as LOCK_NODE_REF.

Suggested-by: Torsten Bögershausen <tboegi@web.de>
Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

cache.h

@@ -583,7 +583,7 @@ struct lock_file {
 	struct strbuf filename;
 };
 #define LOCK_DIE_ON_ERROR 1
-#define LOCK_NODEREF 2
+#define LOCK_NO_DEREF 2
 extern int unable_to_lock_error(const char *path, int err);
 extern void unable_to_lock_message(const char *path, int err,
 				   struct strbuf *buf);