[nrf fromtree] net: dhcpv6: Fix params check

Fix params check.

Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
(cherry picked from commit d68db1e)
Signed-off-by: Robert Lubos <robert.lubos@nordicsemi.no>

subsys/net/ip/dhcpv6.c

@@ -2100,7 +2100,7 @@ void net_dhcpv6_start(struct net_if *iface, struct net_dhcpv6_params *params)
 		goto out;
 	}
 
-	if (!params->request_addr && !params->request_addr) {
+	if (!params->request_addr && !params->request_prefix) {
 		NET_ERR("Information Request not supported yet");
 		goto out;
 	}