RFR(XS): 8131676: Fix warning 'negative int converted to unsigned' after 8085932.

[Lindenmaier, Goetz]

Hi,

A new warning kills the build with gcc 4.2.
Could I please get a review and a sponsor for this tiny change?
http://cr.openjdk.java.net/~goetz/webrevs/8131676-negUInt/webrev.01/

Best regards,
  Goetz.
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