close responses

This fixes file descriptor leak which after some time leaves sockets in
CLOSE_WAIT state.

src/fluentbit_wendelin.go

@@ -99,6 +99,7 @@ func FLBPluginFlushCtx(ctx, data unsafe.Pointer, length C.int, tag *C.char) int
 		fmt.Fprintf(os.Stderr, "got error %s", err.Error())
 		return output.FLB_RETRY
 	}
+	defer rsp.Body.Close()
 	if rsp.StatusCode != 204 {
 		fmt.Fprintf(os.Stderr, "status code %d", rsp.StatusCode)
 		return output.FLB_RETRY