[SCSI] iscsi class: fix endpoint leak

class_find_device gets a ref to the device so we must release it.
The class will serialize access to the ep so we do not have to worry
about a remove racing with the callers access, so we can simplify the
use and drop the ref right away.
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

drivers/scsi/scsi_transport_iscsi.c

@@ -219,6 +219,7 @@ EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
 
 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
 {
+	struct iscsi_endpoint *ep;
 	struct device *dev;
 
 	dev = class_find_device(&iscsi_endpoint_class, &handle,
@@ -226,7 +227,13 @@ struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
 	if (!dev)
 		return NULL;
 
-	return iscsi_dev_to_endpoint(dev);
+	ep = iscsi_dev_to_endpoint(dev);
+	/*
+	 * we can drop this now because the interface will prevent
+	 * removals and lookups from racing.
+	 */
+	put_device(dev);
+	return ep;
 }
 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);