ethernet: marvell: octeontx2 Fix resource not freed after malloc

fix rxsc and txsc not getting freed before going out of scope

Fixes: c54ffc73

 ("octeontx2-pf: mcs: Introduce MACSEC hardware offloading")
Signed-off-by: Manank Patel <pmanank200502@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>