wg: Use zfree.

Reviewed by:	kevans, markj, emaste
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D36911

sys/dev/wg/if_wg.c

@@ -2452,8 +2452,7 @@ wgc_set(struct wg_softc *sc, struct wg_data_io *wgd)
 	sx_xunlock(&sc->sc_lock);
 	nvlist_destroy(nvl);
 out:
-	explicit_bzero(nvlpacked, wgd->wgd_size);
-	free(nvlpacked, M_TEMP);
+	zfree(nvlpacked, M_TEMP);
 	return (err);
 }
 
@@ -2577,8 +2576,7 @@ wgc_get(struct wg_softc *sc, struct wg_data_io *wgd)
 	wgd->wgd_size = size;
 
 out:
-	explicit_bzero(packed, size);
-	free(packed, M_NVLIST);
+	zfree(packed, M_NVLIST);
 err:
 	nvlist_destroy(nvl);
 	return (err);

sys/dev/wg/wg_noise.c

@@ -223,8 +223,7 @@ noise_local_put(struct noise_local *l)
 		rw_destroy(&l->l_identity_lock);
 		mtx_destroy(&l->l_remote_mtx);
 		mtx_destroy(&l->l_index_mtx);
-		explicit_bzero(l, sizeof(*l));
-		free(l, M_NOISE);
+		zfree(l, M_NOISE);
 	}
 }
 
@@ -472,8 +471,7 @@ noise_remote_smr_free(struct epoch_context *smr)
 	noise_local_put(r->r_local);
 	rw_destroy(&r->r_handshake_lock);
 	mtx_destroy(&r->r_keypair_mtx);
-	explicit_bzero(r, sizeof(*r));
-	free(r, M_NOISE);
+	zfree(r, M_NOISE);
 }
 
 void
@@ -754,8 +752,7 @@ noise_keypair_smr_free(struct epoch_context *smr)
 	kp = __containerof(smr, struct noise_keypair, kp_smr);
 	noise_remote_put(kp->kp_remote);
 	rw_destroy(&kp->kp_nonce_lock);
-	explicit_bzero(kp, sizeof(*kp));
-	free(kp, M_NOISE);
+	zfree(kp, M_NOISE);
 }
 
 void