btrfs: fix the commment for the action flags in delayed-ref.h
btrfs: fix the commment for the action flags in delayed-ref.h

The action field has been merged into struct btrfs_delayed_ref_node,
and no struct btrfs_delayed_ref is available now.

Signed-off-by: Wang Sheng-Hui <bb485778c59c959c620dcf404550d8d7642fd953@gmail.com>
Signed-off-by: Jiri Kosina <ed58f755cc8caaf10c3e8c731a8b86fb8f13d6cb@suse.cz>

KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs