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

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

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

Test-Parameters: trivial
Signed-off-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Change-Id: I7902663406b486e386693604e08d2709980955c7
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/54038
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: Oleg Drokin <green@whamcloud.com>