selftests/bpf: Remove memory leak

The allocated entry is immediately overwritten by an assignment. Fix
that.
Signed-off-by: NBjörn Töpel <bjorn.topel@intel.com>
Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20210122154725.22140-5-bjorn.topel@gmail.com

tools/testing/selftests/bpf/xdpxceiver.c

@@ -728,7 +728,6 @@ static void worker_pkt_validate(void)
 	u32 payloadseqnum = -2;
 
 	while (1) {
-		pkt_node_rx_q = malloc(sizeof(struct pkt));
 		pkt_node_rx_q = TAILQ_LAST(&head, head_s);
 		if (!pkt_node_rx_q)
 			break;