LU-6142 ptlrpc: Fix style issues for layout.c

LU-6142 ptlrpc: Fix style issues for layout.c

This patch fixes issues reported by checkpatch
for file lustre/ptlrpc/layout.c

Test-Parameters: trivial
Signed-off-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Change-Id: Ib482495ede6264dd3d42f90dbc50606487fd0b52
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/51926
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Timothy Day <timday@amazon.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>