use of an attribute may cause an attribute directory access, causing a get_vnode
call that leads to KDL due to the mount not yet having completed as seen in
#8090. Moving the volume_ops initialization in bfs_mount earlier might make this
work, but it is a hack at most, as we can't really know what state the VFS is in
during a mount.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@43229 a95241bf-73f2-0310-859d-f6bbb57e9c96