[committed] Add a missing break.

[Paolo Bonzini]

Committed as obvious.  It was triggered by a patch I am working on, and 
adding the "break" produced the correct results.

Paolo

2005-02-21  Paolo Bonzini  <bonzini@gnu.org>

         * simplify-rtx.c (simplify_unary_operation): Add a missing
         "break" statement.
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