socket: drop redundant TAKE_FD(cfd) line

In the only two codepaths we reach this place we know that cfd is
already invalidated. In the Accept=yes case there's already a
TAKE_FD() a few lines further up, and in the Accept=no case there is no
connection fd anyway.

src/core/socket.c

@@ -2432,7 +2432,6 @@ static void socket_enter_running(Socket *s, int cfd_in) {
                 unit_add_to_dbus_queue(UNIT(s));
         }
 
-        TAKE_FD(cfd);
         return;
 
 refuse: