cifs: Check the lease context if we actually got a lease

Some servers may return that we got a lease in rsp->OplockLevel
but then in the lease context contradict this and say we got no lease
at all.  Thus we need to check the context if we have a lease.
Additionally, If we do not get a lease we need to make sure we close
the handle before we return an error to the caller.

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Cc: stable@vger.kernel.org
Reviewed-by: Bharath SM <bharathsm@microsoft.com>
Reviewed-by: Paulo Alcantara (SUSE) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>