fixed comment, fixed unused parameter in mppe_compress()

src/include/lwip/netif.h

@@ -280,7 +280,7 @@ struct netif {
   /** counters */
   u32_t ifinoctets;
   u32_t ifinucastpkts;
-  u32_t ifinnucastpkts; /* @todo: never incremented */
+  u32_t ifinnucastpkts;
   u32_t ifindiscards;
   u32_t ifoutoctets;
   u32_t ifoutucastpkts;

src/netif/ppp/mppe.c

@@ -202,6 +202,8 @@ mppe_compress(ppp_pcb *pcb, ppp_mppe_state *state, struct pbuf **pb, u16_t proto
 	u8_t *pl;
 	err_t err;
 
+	LWIP_UNUSED_ARG(pcb);
+
 	/* TCP stack requires that we don't change the packet payload, therefore we copy
 	 * the whole packet before encryption.
 	 */