6747934 Some locking variables are not properly initialized or destroyed

[ricardo.m.corr...@sun.com]

Author: Ricardo M. Correia <Ricardo.M.Correia at Sun.COM>
Repository: /hg/onnv/onnv-gate
Latest revision: d7abf7c1f1c186f5a9c408985336c02e64e71602
Total changesets: 1
Log message:
6747934 Some locking variables are not properly initialized or destroyed

Files:
        update: usr/src/uts/common/fs/zfs/arc.c
        update: usr/src/uts/common/fs/zfs/dnode.c
        update: usr/src/uts/common/fs/zfs/space_map.c
        update: usr/src/uts/common/fs/zfs/txg.c