In case user chose to set T10-PI enable on the target while
the IB device does not support it, gracefully reject the request.
Reported-by: NSlava Shwartsman <valyushash@gmail.com>
Signed-off-by: NSagi Grimberg <sagig@mellanox.com>
Cc: stable@vger.kernel.org # 3.15+
Signed-off-by: NNicholas Bellinger <nab@linux-iscsi.org>