octeontx2-af: Fixed variable set but not used warnings

commit 6961dc3735ce0716a45c5b43b284420e56a4428e from
git@git.assembla.com:cavium/WindRiver.linux.git

Change-Id: Ia81e289065372bf38085238ff422a4d3e4f59667
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/90889


Tested-by: sa_ip-sw-jenkins <sa_ip-sw-jenkins@marvell.com>
Reviewed-by: Kiran Kumar Kokkilagadda <kirankumark@marvell.com>
Signed-off-by: Wenlin Kang <wenlin.kang@windriver.com>