Problem reported/corrected by Tony Battersby [tonyb@cybernetics.com]:

  o The qla2xxx driver calculates data transfer residuals
    for some but not all circumstances.  The patch below
    adds data transfer residual calculations for the
    remaining cases.

  o Interrogate the proper cmnd[] array when determining
    the transfer direction.
Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>