K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2014-10-31T10:35:01.183849Z
K 7
svn:log
V 158
filedesc: drop retval argument from do_dup

It was almost always td_retval anyway.

For the one case where it is not, preserve the old value across the call.

END