LU-6142 osd-ldiskfs: Fix style issues for osd_io.c

LU-6142 osd-ldiskfs: Fix style issues for osd_io.c

This patch fixes issues reported by checkpatch
for file lustre/osd-ldiskfs/osd_io.c

Test-Parameters: trivial
Signed-off-by: Arshad Hussain <arshad.super@gmail.com>
Change-Id: Iab3fdfa20271f53a794a88d71abfa4f0e72afb07
Reviewed-on: https://review.whamcloud.com/38788
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Ben Evans <beevans@whamcloud.com>
Reviewed-by: Petros Koutoupis <petros.koutoupis@hpe.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>