net/pcap: fix possible mbuf double freeing

[ upstream commit 49a0a2f ]

In the eth_pcap_tx() and eth_pcap_tx_dumper() functions mbufs were freed
without incrementing num_tx.
This may lead application also try to free or use invalid mbuf.

To fix the issue, the mbuf freeing was removed.

Fixes: 6db141c ("pcap: support jumbo frames")

Signed-off-by: Aideen McLoughlin <aideen.mcloughlin@intel.com>
Acked-by: Ferruh Yigit <ferruh.yigit@intel.com>

drivers/net/pcap/rte_eth_pcap.c

@@ -297,7 +297,6 @@ eth_pcap_tx_dumper(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 					mbuf->pkt_len,
 					ETHER_MAX_JUMBO_FRAME_LEN);
 
-				rte_pktmbuf_free(mbuf);
 				break;
 			}
 		}
@@ -359,7 +358,6 @@ eth_pcap_tx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 					mbuf->pkt_len,
 					ETHER_MAX_JUMBO_FRAME_LEN);
 
-				rte_pktmbuf_free(mbuf);
 				break;
 			}
 		}