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Fix a bug in calculation of checksum deduction:
- To get 16 bit one's complement value from uint32_t variable,
higher 16 bits should be ignored.
- RFC 1624 describes methods to recalculate checksum field in headers,
i.e. one's complement of one's complement sum that could be 0x0000,
but we don't have to use the strategy to deduct one's complement sum
itself which won't be zero but should be 0xffff.
Found on debugging mec(4) on sgimips O2.
- To get 16 bit one's complement value from uint32_t variable,
higher 16 bits should be ignored.
- RFC 1624 describes methods to recalculate checksum field in headers,
i.e. one's complement of one's complement sum that could be 0x0000,
but we don't have to use the strategy to deduct one's complement sum
itself which won't be zero but should be 0xffff.
Found on debugging mec(4) on sgimips O2.