Fix OnValidMachine validator when number of machines is unlimited

The OnValidMachine validator incorrectly indicated that the license key
was running on an invalid device when the license key had max number of
machines set to 0.

Author: svedi

include/cryptolens/validators/OnValidMachineValidator.hpp

@@ -22,9 +22,11 @@ class OnValidMachineValidator_ {
     auto const& expected_machine_code = env.get_machine_code();
     bool floating = env.get_floating();
 
-    bool valid = false;
     auto const& machines = license_key_information.get_activated_machines();
-    if (machines) {
+    auto const& maxnoofmachines = license_key_information.get_maxnoofmachines();
+    bool valid = (maxnoofmachines && *maxnoofmachines == 0)
+	      || !machines;
+    if (machines && !valid) {
       std::string full_expected_machine_code;
       if (floating) { full_expected_machine_code += "floating:"; }
       full_expected_machine_code += expected_machine_code;