- Avoid overflowing the swap size counters in human-readable mode   by introducing the new CONVERT_BLOCKS macro which operates on   sizes already converted to number of blocks.  With this macro   it is not longer needed to perform needless multiplication by   blocksize just to divide on it later in CONVERT macro.
- Avoid overflowing the swap size counters in human-readable mode
  by introducing the new CONVERT_BLOCKS macro which operates on
  sizes already converted to number of blocks.  With this macro
  it is not longer needed to perform needless multiplication by
  blocksize just to divide on it later in CONVERT macro.

Approved by:	re (kib)
MFC after:	1 week

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