(PECL inotify >= 0.1.2)
inotify_rm_watch — Remove an existing watch from an inotify instance
inotify_rm_watch() removes the watch watch_descriptor from the inotify instance inotify_instance.
Resource returned by inotify_init()
Watch to remove from the instance
成功时返回 TRUE, 或者在失败时返回 FALSE.