6436526 delete_queue thread reporting drained when it may not be true

[mark.shellenb...@sun.com]

Author: marks
Repository: /hg/onnv/onnv-gate
Revision: f03c5ab5eefa7c661adba7baa2ca6f7941b3c7c9
Log message:
6436526 delete_queue thread reporting drained when it may not be true

Files:
        update: usr/src/uts/common/fs/zfs/zfs_dir.c