LU-7952 osp: Move strlen() call below LASSERT()

LU-7952 osp: Move strlen() call below LASSERT()

This patch moves the strlen() call below LASSERT(). This
avoids a case when parameter to strlen() is NULL and
dereferencing the NULL pointer would cause fault before
it reaches LASSERT().

Signed-off-by: Arshad Hussain <arshad.hussain@seagate.com>
Change-Id: Ie7a683751cf44d7dfad6de1a9024c5fb7a35c35d
Reviewed-on: https://review.whamcloud.com/20919
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>