selftests: nci: Fix the code for next nlattr offset

nlattr could have a padding for 4 bytes alignment. So next nla's offset
should be calculated with a padding.
Signed-off-by: NBongsu Jeon <bongsu.jeon@samsung.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

tools/testing/selftests/nci/nci_dev.c

@@ -113,8 +113,8 @@ static int send_cmd_mt_nla(int sd, __u16 nlmsg_type, __u32 nlmsg_pid,
 		if (nla_len > 0)
 			memcpy(NLA_DATA(na), nla_data[cnt], nla_len[cnt]);
 
-		msg.n.nlmsg_len += NLMSG_ALIGN(na->nla_len);
-		prv_len = na->nla_len;
+		prv_len = NLA_ALIGN(nla_len[cnt]) + NLA_HDRLEN;
+		msg.n.nlmsg_len += prv_len;
 	}
 
 	buf = (char *)&msg;