1974 'zpool key -u' hangs after changing keysource by 'zpool set keysource'

[anthony.scarp...@sun.com]

Author: Anthony Scarpino <Anthony.Scarpino at Sun.COM>
Repository: /hg/zfs-crypto/gate
Latest revision: 2f6433d33d2fccb40c289b4a7decb0c2d9f4ec03
Total changesets: 1
Log message:
1974 'zpool key -u' hangs after changing keysource by 'zpool set keysource'

Files:
        update: usr/src/lib/libzfs/common/libzfs_crypto.c