LU-17000 obdclass: Fix mem leak in lcfg_setparam_client

LU-17000 obdclass: Fix mem leak in lcfg_setparam_client

if call to llapi_param_get_paths() fails. tmp_path
is left unfreed.

Test-Parameters: trivial
CoverityID: 457066 ("Resource leak")
Fixes: 10a04e32 (LU-16724 ptlrpc: refactor page pools patch 3)
Signed-off-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Change-Id: Ib8962675fcb06a4d6b1539340f4a005dd65b7e02
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/59499
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Timothy Day <timday@amazon.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>