NFSv4.1: Cleanup
NFSv4.1: Cleanup

It is now completely safe to call nfs41_sequence_free_slot with a NULL
slot.

Signed-off-by: Trond Myklebust <cc958843532c615cbd4920e868f78c7985331a5a@primarydata.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs