PPP, EAP: removed malloc() and free()

Replaced pcb->eap.es_{client,server}.ea_peer pointer to a char table,
replaced strdup() with MEMCPY, etc.

src/include/netif/ppp/eap.h

@@ -115,7 +115,7 @@ enum eap_state_code {
 
 struct eap_auth {
 	const char *ea_name;	/* Our name */
-	char *ea_peer;	/* Peer's name */
+	char ea_peer[MAXNAMELEN +1];	/* Peer's name */
 	void *ea_session;	/* Authentication library linkage */
 	u_char *ea_skey;	/* Shared encryption key */
 	u_short ea_namelen;	/* Length of our name */