staging: lustre: modified comparisons against NULL
staging: lustre: modified comparisons against NULL

The explicit comparisons against NULL has been modified to be shorter.

Signed-off-by: Mario Bambagini <abc2c0a4e715e635349a88def380168d3a65c9c8@gmail.com>
Signed-off-by: Greg Kroah-Hartman <4645f7897fd33786a2ee1264d590b3c400559d85@linuxfoundation.org>

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