SONAR suggestions - prevent truncation of arithmetic expressions

Change-Id: I4694c0c3183b991a4f0db793f584bc77a5fb7d60
diff --git a/apps/actn-mdsc/tetunnel-ctl/src/main/java/org/onosproject/actn/mdsc/tetunnelctl/TeTunnelCtl.java b/apps/actn-mdsc/tetunnel-ctl/src/main/java/org/onosproject/actn/mdsc/tetunnelctl/TeTunnelCtl.java
index 5415e83..77961ed 100644
--- a/apps/actn-mdsc/tetunnel-ctl/src/main/java/org/onosproject/actn/mdsc/tetunnelctl/TeTunnelCtl.java
+++ b/apps/actn-mdsc/tetunnel-ctl/src/main/java/org/onosproject/actn/mdsc/tetunnelctl/TeTunnelCtl.java
@@ -254,7 +254,7 @@
 
     private TeTunnelKey getNextTeTunnelKey(TeTopologyKey key) {
         //FIXME need a better way to get a te tunnel id
-        long teTunnelId = teTunnelService.getTeTunnels(key).size() + 1;
+        long teTunnelId = teTunnelService.getTeTunnels(key).size() + 1L;
         return new TeTunnelKey(key, teTunnelId);
     }