if_wg: appease gcc

- remove -ferror-limit option
 - quiet -Wredundant-decls

Reviewed by:	mmacy
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D27559

sys/dev/if_wg/include/sys/if_wg_session_vars.h

@@ -274,9 +274,6 @@ struct wg_tag {
 	int		t_mtu;
 };
 
-int wg_route_add(struct wg_route_table *tbl, struct wg_peer *peer,
-    const struct wg_allowedip *cidr_);
-
 struct wg_peer *wg_route_lookup(struct wg_route_table *, struct mbuf *,
     enum route_direction);
 

sys/dev/if_wg/include/sys/wg_module.h

@@ -47,8 +47,6 @@
 #include <zinc/chacha20poly1305.h>
 #include <crypto/blake2s.h>
 
-MALLOC_DECLARE(M_WG);
-
 
 enum noise_lengths {
 	NOISE_PUBLIC_KEY_LEN = CURVE25519_KEY_SIZE,

sys/dev/if_wg/module/if_wg_session.c

@@ -113,7 +113,6 @@ SYSCTL_INT(_net_wg, OID_AUTO, debug, CTLFLAG_RWTUN, &wireguard_debug, 0,
 #define DPRINTF(sc,  ...) if (wireguard_debug) if_printf(sc->sc_ifp, ##__VA_ARGS__)
 
 /* Socket */
-int	wg_socket_close(struct wg_socket *);
 static int	wg_socket_bind(struct wg_softc *sc, struct wg_socket *);
 static int	wg_send(struct wg_softc *, struct wg_endpoint *, struct mbuf *);
 
@@ -146,9 +145,6 @@ static void	wg_timers_disable(struct wg_timers *);
 static int	wg_queue_in(struct wg_peer *, struct mbuf *);
 static struct mbuf *wg_queue_dequeue(struct wg_queue *, struct wg_tag **);
 
-/* Route */
-void	wg_route_destroy(struct wg_route_table *);
-
 /* Cookie */
 
 static int wg_cookie_validate_packet(struct cookie_checker *, struct mbuf *,

sys/modules/if_wg/Makefile

@@ -14,7 +14,6 @@ ZINCDIR= ${SRCTOP}/sys/dev/if_wg/module/crypto/zinc
 CFLAGS+= -I${INCDIR}
 
 CFLAGS+= -D__KERNEL__
-CFLAGS+= -ferror-limit=7
 
 DEBUG_FLAGS=-g