LU-12931 gnilnd: use time_after() to compare jiffies

LU-12931 gnilnd: use time_after() to compare jiffies

Fix a potential bug in gnilnd it is directly comparing a timeout
against jiffies instead of using time_after() to handle jiffies wrap.

Test-Parameters: trivial
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: Ie4d190e9c04e807f2152b71dc28ef0b0463ebbe5
Reviewed-on: https://review.whamcloud.com/36702
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Neil Brown <neilb@suse.de>
Reviewed-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Reviewed-by: Chris Horn <chris.horn@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>