[S390] dasd: fix device shutdown process.

Fix clear_IO handling (need to wait for interrupt) and
introduced error-handling in shutdown processing.
Signed-off-by: Horst Hummel <horst.hummel@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

drivers/s390/block/dasd_genhd.c

@@ -83,10 +83,12 @@ dasd_gendisk_alloc(struct dasd_device *device)
 void
 dasd_gendisk_free(struct dasd_device *device)
 {
+	if (device->gdp) {
 		del_gendisk(device->gdp);
 		device->gdp->queue = NULL;
 		put_disk(device->gdp);
 		device->gdp = NULL;
+	}
 }
 
 /*