fixup! ipv6 move disable to vhost option

fix missing backslash in multiline macro
diff --git a/lib/private-libwebsockets.h b/lib/private-libwebsockets.h
index 1df2470..5ce6413 100644
--- a/lib/private-libwebsockets.h
+++ b/lib/private-libwebsockets.h
@@ -846,7 +846,7 @@
 
 #ifdef LWS_USE_IPV6
 #define LWS_IPV6_ENABLED(vh) \
-	(!lws_check_opt(vh->context->options, LWS_SERVER_OPTION_DISABLE_IPV6) &&
+	(!lws_check_opt(vh->context->options, LWS_SERVER_OPTION_DISABLE_IPV6) && \
 	 !lws_check_opt(vh->options, LWS_SERVER_OPTION_DISABLE_IPV6))
 #else
 #define LWS_IPV6_ENABLED(context) (0)