[PATCH] problems with USB memory pen

This fixes a bug which was introduced when the code was switched to use
atomic_read()s.

The bug prevents hot-unplugging of SCSI (or emulated SCSI) devices from
working. 

From Patrick Mansfield.

drivers/scsi/scsi_sysfs.c

@@ -412,7 +412,7 @@ void scsi_remove_device(struct scsi_device *sdev)
 		set_bit(SDEV_DEL, &sdev->sdev_state);
 		if (sdev->host->hostt->slave_destroy)
 			sdev->host->hostt->slave_destroy(sdev);
-		if (atomic_read(&sdev->access_count))
+		if (!atomic_read(&sdev->access_count))
 			device_del(&sdev->sdev_gendev);
 		up_write(&class->subsys.rwsem);
 	}