<URL: http://bugs.freeciv.org/Ticket/Display.html?id=38392 >
When ever client connects to new server and gets rulesets (city
styles), tileset_setup_city_tiles() loads city sprites. They are not
freed when connection to old server is cut.
Note that game.control.num_styles was not necessarily same in the old
server (when memory was allocated for old sprite set) and in new
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