net: mvpp2: use correct index on array mvpp2_pools

Array mvpp2_pools is being indexed by long_log_pool, however this
looks like a cut-n-paste bug and in fact should be short_log_pool.

Detected by CoverityScan, CID#1466113 ("Copy-paste error")

Fixes: 576193f2d579 ("net: mvpp2: jumbo frames support")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Antoine Tenart <antoine.tenart@bootlin.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/mvpp2.c

@@ -4632,7 +4632,7 @@ static int mvpp2_swf_bm_pool_init(struct mvpp2_port *port)
 	if (!port->pool_short) {
 		port->pool_short =
 			mvpp2_bm_pool_use(port, short_log_pool,
-					  mvpp2_pools[long_log_pool].pkt_size);
+					  mvpp2_pools[short_log_pool].pkt_size);
 		if (!port->pool_short)
 			return -ENOMEM;