LU-18506 ptlrpc: improve lu_env_add error handling

LU-18506 ptlrpc: improve lu_env_add error handling

Improve error handling for cases when lu_env_add() could fail.

HPE-bug-id: LUS-12726
Fixes: d891becebb ("LU-17668 ptlrpc: create env in few more threads")
Signed-off-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Change-Id: Ie6627438340196ef50355893c52eacf3322fb2ef
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/57272
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>