RDMA/rtrs-clt: Use bitmask to check sess->flags

RDMA/rtrs-clt: Use bitmask to check sess->flags

commit aaed465f761700dace9ab39521013cddaae4f5a3 upstream.

We may want to add new flags, so it's better to use bitmask to check flags.

Fixes: 6a98d71daea1 ("RDMA/rtrs: client: main functionality")
Link: https://lore.kernel.org/r/20201217141915.56989-17-jinpu.wang@cloud.ionos.com
Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com>
Signed-off-by: Gioh Kim <gi-oh.kim@cloud.ionos.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>