[Freeciv-Dev] (PR#6236) uninitialized citymap value

["Jason Short" <jdorje@xxxxxxxxxxxxxxxxxxxxx>]

Valgrind gives this fairly often for the server:

==13287==    at 0x8067A58: auto_arrange_workers (cityturn.c:235)
==13287==    by 0x8064F54: create_city (citytools.c:1015)
==13287==    by 0x8057618: city_build (unithand.c:575)
==13287==    by 0x8057675: handle_unit_build_city (unithand.c:595)
==13287==    by 0x8095956: ai_do_build_city (settlers.c:71)
==13287==    by 0x8098D06: auto_settler_findwork (settlers.c:1328)
==13287==    by 0x80990B3: auto_settlers_player (settlers.c:1402)
==13287==    by 0x80996C9: auto_settlers (settlers.c:1548)
==13287==    by 0x804F34F: main_loop (srv_main.c:1502)
==13287==    by 0x804FA8E: srv_loop (srv_main.c:1803)
==13287==    by 0x804F512: srv_main (srv_main.c:1590)
==13287==    by 0x804A20F: main (civserver.c:154)

The callers may vary, but the line remains the same.

Could relate to PR#6222, but I doubt it (this is just an invalid read). 
  This may have been reported before.  We really need to fix it.

jason