LU-6502 lnet: remove unnecessary NULL check

LU-6502 lnet: remove unnecessary NULL check

In LNetCtl():IOC_LIBCFS_GET_NET there is a check for config == NULL
This is not necessary as it'll never be NULL.  That's ensured before
the call to LNetCtl.

Signed-off-by: Amir Shehata <amir.shehata@intel.com>
Change-Id: Ib4d1ca5ca4a342f134e3102bcaf167e60f978b5f
Reviewed-on: http://review.whamcloud.com/15779
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>