Skip castle rights update when not needed
authorMarco Costalba <mcostalba@gmail.com>
Thu, 18 Jun 2009 13:22:39 +0000 (15:22 +0200)
committerMarco Costalba <mcostalba@gmail.com>
Thu, 18 Jun 2009 16:23:35 +0000 (17:23 +0100)
Micro optimization in do_move(), a quick check
avoid us to update castle rights in almost 90%
of cases.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>

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