tree-wide: always use TAKE_FD() when calling rearrange_stdio()

rearrange_stdio() invalidates specified fds even on failure, which means
we should always invalidate the fds we pass in no matter what. Let's
make this explicit by using TAKE_FD() for that everywhere.

Note that in many places we such invalidation doesnt get us much
behaviour-wise, since we don't use the variables anymore later. But
TAKE_FD() in a way is also documentation, it encodes explicitly that the
fds are invalidated here, so I think it's a good thing to always make
this explicit here.

src/libsystemd/sd-bus/bus-socket.c

@@ -988,7 +988,9 @@ int bus_socket_exec(sd_bus *b) {
         if (r == 0) {
                 /* Child */
 
-                if (rearrange_stdio(s[1], s[1], STDERR_FILENO) < 0)
+                r = rearrange_stdio(s[1], s[1], STDERR_FILENO);
+                TAKE_FD(s[1]);
+                if (r < 0)
                         _exit(EXIT_FAILURE);
 
                 (void) rlimit_nofile_safe();