NFSv4/pnfs: The layout barrier indicate a minimal value for the seqid

NFSv4/pnfs: The layout barrier indicate a minimal value for the seqid

[ Upstream commit d6236a98b3bab07c0a1455fd1ab46f79c3978cdc ]

The intention of the layout barrier is to ensure that we do not update
the layout to match an older value than the current expectation. Fix the
test in pnfs_layout_stateid_blocked() to reflect that it is legal for
the seqid of the stateid to match that of the barrier.

Fixes: aa95edf309ef ("NFSv4/pnfs: Fix the layout barrier update")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>