liquidio: remove unnecessary variable assignment

gcc points out an useless assignment that was added during code refactoring:

drivers/net/ethernet/cavium/liquidio/lio_ethtool.c: In function 'octnet_intrmod_callback':
drivers/net/ethernet/cavium/liquidio/lio_ethtool.c:1315:59: error: parameter 'oct_dev' set but not used [-Werror=unused-but-set-parameter]

This is harmless but can clearly be remove to avoid the warning.

Fixes: 50c0add534d2 ("liquidio: refactor interrupt moderation code")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/cavium/liquidio/lio_ethtool.c

@@ -1323,8 +1323,6 @@ static void octnet_intrmod_callback(struct octeon_device *oct_dev,
 
 	ctx->status = status;
 
-	oct_dev = lio_get_device(ctx->octeon_id);
-
 	WRITE_ONCE(ctx->cond, 1);
 
 	/* This barrier is required to be sure that the response has been