PNFS fallback to MDS if no deviceid found

commit b1029c9bc078a6f1515f55dd993b507dcc7e3440 upstream.

If we fail to find a good deviceid while trying to pnfs instead of
propogating an error back fallback to doing IO to the MDS. Currently,
code with fals the IO with EINVAL.

Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
Fixes: 8d40b0f1 ("NFS filelayout:call GETDEVICEINFO after pnfs_layout_process completes"
Cc: stable@vger.kernel.org # v4.11+
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>