Fix unused ret value.

@jolting I think this is what you implied in your commit comment from weeks ago... now I saw it ;-)

Author: jlblancoc

libs/hwdrivers/src/CVelodyneScanner.cpp

@@ -918,7 +918,7 @@ bool CVelodyneScanner::internal_send_http_post(const std::string &post_data)
 		&out_headers
 		);
 
-	return http_rep_code == 200 || http_rep_code == 204; // OK codes
+	return   mrpt::utils::net::erOk==ret && (http_rep_code == 200 || http_rep_code == 204); // OK codes
 
 	MRPT_END;
 }