vfs2: remove redundant tuple() from tree_items arg
vfs2: remove redundant tuple() from tree_items arg

Tested-by: Rob Browning <1dc5917c2adeeba13d1ef33dbb40691a1b67cc65@defaultvalue.org>
Signed-off-by: Rob Browning <1dc5917c2adeeba13d1ef33dbb40691a1b67cc65@defaultvalue.org>

ToxicFrog/bup,ToxicFrog/bup,ToxicFrog/bup,ToxicFrog/bup,ToxicFrog/bup