locks: remove unused lm_release_private

In commit 3b6e2723 ("locks: prevent side-effects of
locks_release_private before file_lock is initialized") we removed the
last user of lm_release_private without removing the field itself.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Documentation/filesystems/Locking

@@ -359,7 +359,6 @@ prototypes:
 	int (*lm_compare_owner)(struct file_lock *, struct file_lock *);
 	void (*lm_notify)(struct file_lock *);  /* unblock callback */
 	int (*lm_grant)(struct file_lock *, struct file_lock *, int);
-	void (*lm_release_private)(struct file_lock *);
 	void (*lm_break)(struct file_lock *); /* break_lease callback */
 	int (*lm_change)(struct file_lock **, int);
 
@@ -368,7 +367,6 @@ locking rules:
 lm_compare_owner:	yes		no
 lm_notify:		yes		no
 lm_grant:		no		no
-lm_release_private:	maybe		no
 lm_break:		yes		no
 lm_change		yes		no
 

fs/locks.c

@@ -200,11 +200,7 @@ void locks_release_private(struct file_lock *fl)
 			fl->fl_ops->fl_release_private(fl);
 		fl->fl_ops = NULL;
 	}
-	if (fl->fl_lmops) {
-		if (fl->fl_lmops->lm_release_private)
-			fl->fl_lmops->lm_release_private(fl);
-		fl->fl_lmops = NULL;
-	}
+	fl->fl_lmops = NULL;
 
 }
 EXPORT_SYMBOL_GPL(locks_release_private);

include/linux/fs.h

@@ -1162,7 +1162,6 @@ struct lock_manager_operations {
 	int (*lm_compare_owner)(struct file_lock *, struct file_lock *);
 	void (*lm_notify)(struct file_lock *);	/* unblock callback */
 	int (*lm_grant)(struct file_lock *, struct file_lock *, int);
-	void (*lm_release_private)(struct file_lock *);
 	void (*lm_break)(struct file_lock *);
 	int (*lm_change)(struct file_lock **, int);
 };