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Treat register numbers as unsigned. Treat signed operand values as
signed.

This resolves multiple instances of the Cppcheck warning:

warning: %i in format string (no. 1) requires 'int' but the argument
  type is 'unsigned int'. [invalidPrintfArgType_sint]
Acked-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Jens Remus <jremus@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>