LU-16575 lnet: memory leak in copy_ioc_udsp_descr

LU-16575 lnet: memory leak in copy_ioc_udsp_descr

copy_ioc_udsp_descr() doesn't correctly handle the case where a
net number was not specified. In this case, there isn't any net
number range that needs to be copied into the udsp descriptor.

Test-Parameters: trivial testlist=sanity-lnet env=ONLY=400
Signed-off-by: Chris Horn <chris.horn@hpe.com>
Change-Id: Ica900e2b0ec816237a8303d1d9e07cc1f6c5a652
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/50081
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Serguei Smirnov <ssmirnov@whamcloud.com>
Reviewed-by: Frank Sehr <fsehr@whamcloud.com>
Reviewed-by: Cyril Bordage <cbordage@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>