ceph: flush cap release queue when trimming session caps

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 19fbfc4..2b4d093 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -1311,6 +1311,9 @@
 			trim_caps - session->s_trim_caps);
 		session->s_trim_caps = 0;
 	}
+
+	ceph_add_cap_releases(mdsc, session);
+	ceph_send_cap_releases(mdsc, session);
 	return 0;
 }