LU-18791 lmv: report an overflowed nlink correctly

LU-18791 lmv: report an overflowed nlink correctly

inode nlink count should be set to 1 if any component
stripe in stripped dir has overflowed and been set to 1

HPE-bug-id: LUS-12747
Signed-off-by: Corey Tesdahl <corey.tesdahl@hpe.com>
Change-Id: I2a3b6f5bd846d11d768ee1979b7f11f0e7cf1c88
Signed-off-by: Alexander Zarochentsev <alexander.zarochentsev@hpe.com>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/58357
Reviewed-by: Andrew Perepechko <andrew.perepechko@hpe.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>