staging/lustre: fix sparse warning
staging/lustre: fix sparse warning

Fix sparse complaint: "Using plain integer as NULL pointer"

Signed-off-by: Denis Pithon <67debe7d3831310217f64a1da86a764eca776646@gmail.com>
Signed-off-by: Greg Kroah-Hartman <4645f7897fd33786a2ee1264d590b3c400559d85@linuxfoundation.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs