examples/distributor: fix distributor on Rx core

This patch fixes the syntax error when using the single-core
for both Rx and distributor functions.

Fixes: 4a7f40c ("examples/distributor: add dedicated core")
Cc: stable@dpdk.org

Signed-off-by: Abdullah Ömer Yamaç <omer.yamac@ceng.metu.edu.tr>
Acked-by: Ferruh Yigit <ferruh.yigit@xilinx.com>
Tested-by: David Hunt <david.hunt@intel.com>

examples/distributor/main.c

@@ -261,8 +261,8 @@ lcore_rx(struct lcore_params *p)
  * packets are then send straight to the tx core.
  */
 #if 0
-	rte_distributor_process(d, bufs, nb_rx);
-	const uint16_t nb_ret = rte_distributor_returned_pktsd,
+		rte_distributor_process(p->d, bufs, nb_rx);
+		const uint16_t nb_ret = rte_distributor_returned_pkts(p->d,
 			bufs, BURST_SIZE*2);
 
 		app_stats.rx.returned_pkts += nb_ret;