NPE in ConnectionWatchdog fixed

redisson/src/main/java/org/redisson/client/handler/ConnectionWatchdog.java

@@ -65,6 +65,7 @@ public class ConnectionWatchdog extends ChannelInboundHandlerAdapter {
     @Override
     public void channelInactive(ChannelHandlerContext ctx) throws Exception {
         RedisConnection connection = RedisConnection.getFrom(ctx.channel());
+        if (connection != null) {
             connection.onDisconnect();
             if (!connection.isClosed()) {
                 if (connection.isFastReconnect()) {
@@ -74,6 +75,7 @@ public class ConnectionWatchdog extends ChannelInboundHandlerAdapter {
                     reconnect(connection, 1);
                 }
             }
+        }
         ctx.fireChannelInactive();
     }