LU-17000 misc: fix strscpy() Coverity warnings

LU-17000 misc: fix strscpy() Coverity warnings

Fix warning reported for use of uninitialized vairable

CoverityID: 425254 ("Uninitialized scalar variable")

Fix warning reported when changing call from strlcpy()
to strscpy()

CoverityID: 425253 ("Unsigned compared against 0")
CoverityID: 425262 ("Unsigned compared against 0")
Fixes: 7a0517fa2 ("LU-17592 build: kernel 6.8 removed strlcpy()")

Test-Parameters: trivial
Signed-off-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Change-Id: Id3804c77a105e4776a0242db787dc1ca2528d9ca
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/54865
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>