scsi: sd: Remove a superfluous assignment

Since blk_rq_bytes(req) returns req->__data_len, assigning that value to
req->__data_len is superfluous. Hence remove that assignment.

See also commit 5db44863b6eb ("[SCSI] sd: Implement support for WRITE SAME").

Signed-off-by: Bart Van Assche <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/sd.c

···
 				} else {
 					sdkp->device->no_write_same = 1;
 					sd_config_write_same(sdkp);
-					req->__data_len = blk_rq_bytes(req);
 					req->rq_flags |= RQF_QUIET;
 				}
 				break;