undo hangs

[justin at shiningsilence.com]

I munged up a file, and wasn't able to retrieve the last version using
undo on a Hammer volume:

Do this on leaf:

undo -o local.css.old /usr/pkg/share/ikiwiki/basewiki/local.css

The process does not return:

root    23659  0.0  0.0  1552  628   0  IL+   7:30PM   0:00.00   undo -o
local.css.old /usr/pkg/share/ikiwiki/basewiki/local.css

Not sure if I just missed something...  I was able to retrieve the file
from a snapshot.