Cluster: use long long for timestamps in clusterGenNodesDescription().

Ping sent and pong received fields need to be casted to long long to be
printed correctly into 32 bit systems.

src/cluster.c

@@ -2404,9 +2404,9 @@ sds clusterGenNodesDescription(int filter) {
             ci = sdscatprintf(ci,"- ");
 
         /* Latency from the POV of this node, link status */
-        ci = sdscatprintf(ci,"%ld %ld %llu %s",
-            (long) node->ping_sent,
-            (long) node->pong_received,
+        ci = sdscatprintf(ci,"%lld %lld %llu %s",
+            (long long) node->ping_sent,
+            (long long) node->pong_received,
             (unsigned long long) node->configEpoch,
             (node->link || node->flags & REDIS_NODE_MYSELF) ?
                         "connected" : "disconnected");