route: add size to free(9) calls

[Klemens Nanni]

Those are for the gateway sockaddrs which get allocated in rt_setgate()
with the same ROUNDUP(sa_len) approach.

mpi already added a sizes for a few rt_gateway sockaddrs in two commits,
these are the last one in route.c leaving only ifafree() behind.

Also tested on a few machines during last weeks.

Feedback? OK?


Index: route.c
===================================================================
RCS file: /cvs/src/sys/net/route.c,v
retrieving revision 1.394
diff -u -p -r1.394 route.c
--- route.c     24 Jun 2020 22:03:43 -0000      1.394
+++ route.c     27 Jul 2020 00:10:17 -0000
@@ -932,7 +932,8 @@ rtrequest(int req, struct rt_addrinfo *i
                        ifafree(ifa);
                        rtfree(rt->rt_parent);
                        rt_putgwroute(rt);
-                       free(rt->rt_gateway, M_RTABLE, 0);
+                       free(rt->rt_gateway, M_RTABLE,
+                           ROUNDUP(rt->rt_gateway->sa_len));
                        free(ndst, M_RTABLE, ndst->sa_len);
                        pool_put(&rtentry_pool, rt);
                        return (error);
@@ -964,7 +965,8 @@ rtrequest(int req, struct rt_addrinfo *i
                        ifafree(ifa);
                        rtfree(rt->rt_parent);
                        rt_putgwroute(rt);
-                       free(rt->rt_gateway, M_RTABLE, 0);
+                       free(rt->rt_gateway, M_RTABLE,
+                           ROUNDUP(rt->rt_gateway->sa_len));
                        free(ndst, M_RTABLE, ndst->sa_len);
                        pool_put(&rtentry_pool, rt);
                        return (EEXIST);