[SCSI] iscsi: return data transfer residual for data-out commands

Currently, the iSCSI driver returns the data transfer residual for
data-in commands (e.g. read) but not data-out commands (e.g. write).
This patch makes it return the data transfer residual for both types of
commands.
Signed-off-by: Tony Battersby <tonyb@cybernetics.com>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

drivers/scsi/libiscsi.c

@@ -291,9 +291,6 @@ invalid_datalen:
 			   min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
 	}
 
-	if (sc->sc_data_direction == DMA_TO_DEVICE)
-		goto out;
-
 	if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) {
 		int res_count = be32_to_cpu(rhdr->residual_count);