node: remove useless return code assignment

No need to store the return code of rte_lpm6_lookup_bulk_func()
as it returns error only if parameters are NULL.
In the function ip6_lookup_node_process_scalar(),
these variables will never be NULL.

Not checking the return code will avoid check in datapath.
Storing of the return code is useless and removed.

Coverity issue: 385595
Fixes: 20365d7 ("node: add IPv6 lookup node")

Signed-off-by: Amit Prakash Shukla <amitprakashs@marvell.com>

lib/node/ip6_lookup.c

@@ -135,7 +135,7 @@ ip6_lookup_node_process_scalar(struct rte_graph *graph, struct rte_node *node,
 		node_mbuf_priv1(mbuf3, dyn)->ttl = ipv6_hdr->hop_limits;
 		rte_memcpy(ip_batch[3], ipv6_hdr->dst_addr, 16);
 
-		rc = rte_lpm6_lookup_bulk_func(lpm6, ip_batch, next_hop, 4);
+		rte_lpm6_lookup_bulk_func(lpm6, ip_batch, next_hop, 4);
 
 		next_hop[0] = (next_hop[0] < 0) ? (int32_t)drop_nh : next_hop[0];
 		node_mbuf_priv1(mbuf0, dyn)->nh = (uint16_t)next_hop[0];