ixgbe: cleanup checksum to allow error results
Currently the shared code checksum calculation function only returns a u16 and cannot return an error code. Unfortunately a variety of errors can happen that completely prevent the calculation of a checksum. So, change the function return value from a u16 to an s32 and return a negative value on error, or the positive checksum value when there is no error. Signed-off-by: Don Skidmore <donald.c.skidmore@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
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