parse endianness warnings

Fix endianness problems detect by sparse, introduced with the enhanced
MPA patch.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Tatyana Nikolova <Tatyana.E.Nikolova@intel.com>
Signed-off-by: Faisal Latif <Faisal.Latif@intel.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
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