[SCSI] fix the return value of scsi_target_queue_read()

It seems that zero should be returned if scsi_target_is_busy(starget) is
true, no matter if sdev is on the starved list.

Signed-off-by: Hillf Danton <[e-mail]>
Reviewed-by: Mike Christie <[e-mail]>
Signed-off-by: James Bottomley <[e-mail]>

drivers/scsi/scsi_lib.c

···
 	}
 
 	if (scsi_target_is_busy(starget)) {
-		if (list_empty(&sdev->starved_entry)) {
+		if (list_empty(&sdev->starved_entry))
 			list_add_tail(&sdev->starved_entry,
 				      &shost->starved_list);
-			return 0;
-		}
+		return 0;
 	}
 
 	/* We're OK to process the command, so we can't be starved */