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csum_inet_update does not handle odd number of bytes on big-endian architectures correctly. When calculating the checksum of odd number of bytes, the last byte must be interpreted as LSB on little-endian architectures and as MSB on big-endian ones in a 16-bit half-word. Futhermore, the checksum tests assume that the underlying architecture is always little-endian. When a little-endian machine stores a calculated checksum into memory, then the checksum's bytes are automatically swapped. But this is NOT true on a big-endian architecture. Signed-off-by: Alexander Egorenkov <Alexander.Egorenkov@ibm.com>