ceph: check channel is open before closing
ceph: check channel is open before closing

to avoid operator panic we should check the channel
is open before closing as a safety measure.

Signed-off-by: Madhu Rajanna <60fbf37a92c2a0908e31296d18dadbec5a4dae17@gmail.com>

rook/rook,rook/rook,rook/rook,rook/rook,rook/nfs,rook/nfs,rook/rook,rook/nfs