wpa_helpers: Ignore link-local IPv4 address while waiting for DHCP

Do not accept a link-local IPv4 address when waiting for a valid DHCP
address. This helps with hs20-osu-client use cases where DHCP response
has not yet been received.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>

src/common/wpa_helpers.c

@@ -222,7 +222,8 @@ int wait_ip_addr(const char *ifname, int timeout)
 		if (get_wpa_status(ifname, "ip_address", ip, sizeof(ip)) == 0
 		    && strlen(ip) > 0) {
 			printf("IP address found: '%s'\n", ip);
-			return 0;
+			if (strncmp(ip, "169.254.", 8) != 0)
+				return 0;
 		}
 		ctrl = wpa_open_ctrl(ifname);
 		if (ctrl == NULL)