Set scsi_set_resid() only if FCPIO_ICMND_CMPL_RESID_UNDER is set.

Link: https://lore.kernel.org/r/20201121015134.18872-1-kartilak@cisco.comReviewed-by: Arulprabhu Ponnusamy <arulponn@cisco.com>
Co-developed-by: Satish Kharat <satishkh@cisco.com>
Signed-off-by: Satish Kharat <satishkh@cisco.com>
Signed-off-by: Karan Tilak Kumar <kartilak@cisco.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>