Merge pull request #168 from r-craig/master

Fix error condition check on finding correct usb interface.

heimdall/source/BridgeManager.cpp

@@ -231,7 +231,7 @@ int BridgeManager::FindDeviceInterface(void)
 
 	libusb_free_config_descriptor(configDescriptor);
 
-	if (result != LIBUSB_SUCCESS)
+	if (interfaceIndex < 0)
 	{
 		Interface::PrintError("Failed to find correct interface configuration\n");
 		return (BridgeManager::kInitialiseFailed);