RFC 3720 is not clear about whether a target should return SUCCESS or CHECK CONDITION if SPDTL > EDTL. Hence accept both. See also Fred Knight, Re: [Ips] Data Out residual overflow/underflow handling, IETF mailing list archive, 21 September 2012 (http://www.ietf.org/mail-archive/web/ips/current/msg02756.html). Signed-off-by: Bart Van Assche <bvanassche@acm.org>