staging: lustre: fix comparisons should place the constant on the right side

This patch fixes checkpatch.pl warning:

WARNING: Comparisons should place the constant on the right side of the test

Signed-off-by: Aastha Gupta <aastha.gupta4104@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>