nfsd: Make init_open_stateid() a bit more whole

nfsd: Make init_open_stateid() a bit more whole

BugLink: http://bugs.launchpad.net/bugs/1745043
commit 8c7245abda877d4689b3371db8ae2a4400d7d9ce upstream.

Move the state selection logic inside from the caller,
always making it return correct stp to use.

Signed-off-by: J . Bruce Fields <bfields@fieldses.org>
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>