Avoid transfers crossing a 4GB boundary, which can lead to data corruption.  Thanks to scottl@ for the suggestion.
Avoid transfers crossing a 4GB boundary, which can lead to data
corruption.  Thanks to scottl@ for the suggestion.

This change will likely be revised after consideration of a general
method to address this type of issue for other drivers.

Sponsored by:   Sandvine Incorporated
MFC after:      3 days

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