LU-6142 libcfs: Fix style issues for linux-tracefile.c

LU-6142 libcfs: Fix style issues for linux-tracefile.c

This patch fixes issues reported by checkpatch for the file
linux-tracefile.c. It brings us into sync with linux client
code.

Change-Id: Ie058bb837f4b53746b0334f08a1091e5c5fe856d
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: https://review.whamcloud.com/35773
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Shaun Tancheff <stancheff@cray.com>
Reviewed-by: Arshad Hussain <arshad.super@gmail.com>
Reviewed-by: Neil Brown <neilb@suse.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>