xdp: sample: Missing curly braces in read_route()

The assert statement is supposed to be part of the else branch but the
curly braces were accidentally left off.

Fixes: 3e29cd0e6563 ("xdp: Sample xdp program implementing ip forward")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

samples/bpf/xdp_router_ipv4_user.c

@@ -206,12 +206,13 @@ static void read_route(struct nlmsghdr *nh, int nll)
 			direct_entry.arp.mac = 0;
 			direct_entry.arp.dst = 0;
 			if (route.dst_len == 32) {
-				if (nh->nlmsg_type == RTM_DELROUTE)
+				if (nh->nlmsg_type == RTM_DELROUTE) {
 					assert(bpf_map_delete_elem(map_fd[3], &route.dst) == 0);
-				else
+				} else {
 					if (bpf_map_lookup_elem(map_fd[2], &route.dst, &direct_entry.arp.mac) == 0)
 						direct_entry.arp.dst = route.dst;
 					assert(bpf_map_update_elem(map_fd[3], &route.dst, &direct_entry, 0) == 0);
+				}
 			}
 			for (i = 0; i < 4; i++)
 				prefix_key->data[i] = (route.dst >> i * 8) & 0xff;