LU-6142 obdclass: Fix style issues for llog_swab.c

LU-6142 obdclass: Fix style issues for llog_swab.c

This patch fixes issues reported by checkpatch for file
lustre/obdclass/llog_swab.c

Change-Id: Id7f12c7901213b2cbc4d64ed967c6942bcfcb767
Test-Parameters: trivial
Signed-off-by: Arshad Hussain <arshad.super@gmail.com>
Reviewed-on: https://review.whamcloud.com/33502
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Ben Evans <bevans@cray.com>
Reviewed-by: John L. Hammond <jhammond@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>