LU-17062 lnet: Update lnet_peer_*_decref_locked usage

LU-17062 lnet: Update lnet_peer_*_decref_locked usage

Move decref's to occur after last reference to prevent
use after free.

Lustre-change: https://review.whamcloud.com/52184
Lustre-commit: 60cfceb8c59364f786b31ac36c2c245b9a1e495a

HPE-bug-id: LUS-11799
Signed-off-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Change-Id: I2382ece560039383f644b6aee73a9481d6bb5673
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/54897
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Frank Sehr <fsehr@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>