libceph: reference counting pagelist

this allow pagelist to present data that may be sent multiple times.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
Reviewed-by: Sage Weil <sage@redhat.com>
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index e7d9411..9764c77 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -3071,10 +3071,8 @@
 		return;
 
 	WARN_ON(!list_empty(&data->links));
-	if (data->type == CEPH_MSG_DATA_PAGELIST) {
+	if (data->type == CEPH_MSG_DATA_PAGELIST)
 		ceph_pagelist_release(data->pagelist);
-		kfree(data->pagelist);
-	}
 	kmem_cache_free(ceph_msg_data_cache, data);
 }