cgroup: analyze: Report memory configurations that deviate from systemd

This is the most basic consumer of the new systemd-vs-kernel checker,
both acting as a reasonable standalone exerciser of the code, and also
as a way for easy inspection of deviations from systemd internal state.

src/core/socket.c

@@ -843,7 +843,7 @@ static void socket_dump(Unit *u, FILE *f, const char *prefix) {
                 exec_command_dump_list(s->exec_command[c], f, prefix2);
         }
 
-        cgroup_context_dump(&s->cgroup_context, f, prefix);
+        cgroup_context_dump(UNIT(s), f, prefix);
 }
 
 static int instance_from_socket(int fd, unsigned nr, char **instance) {