LU-14460 lnet: fix mismatched printf format

LU-14460 lnet: fix mismatched printf format

Original "%llx" does not work on all platforms. Fix it.

Signed-off-by: Lei Feng <flei@whamcloud.com>
Change-Id: I2edecbf66ccb2141c72294d324ade79574f5c084
Test-Parameters: trivial
Reviewed-on: https://review.whamcloud.com/41755
Reviewed-by: Minh Diep <mdiep@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Olaf Faaland-LLNL <faaland1@llnl.gov>
Reviewed-by: Oleg Drokin <green@whamcloud.com>