Add default block in HttpClientCodec (#11352)

Motivation:

There should always be a default in switch blocks.

Modification:

Add default

Result:

Code cleanup.

Signed-off-by: xingrufei <xingrufei@sogou-inc.com>

codec-http/src/main/java/io/netty/handler/codec/http/HttpClientCodec.java

@@ -310,6 +310,8 @@ public final class HttpClientCodec extends CombinedChannelDuplexHandler<HttpResp
                             }
                         }
                         break;
+                    default:
+                        break;
                 }
             }
             return super.isContentAlwaysEmpty(msg);