Modify gpio and sysfs path check in config validation.

Summary: The check would fail when one of them exist.

Reviewed By: rationalis

Differential Revision: D62767884

fbshipit-source-id: 5889c854ecef9237526c4bc5c4be8e8c85d03144

fboss/platform/fan_service/Utils.cpp

@@ -90,7 +90,7 @@ bool Utils::isValidConfig(const FanServiceConfig& config) {
       XLOG(ERR) << "ledSysfsPath cannot be empty";
       return false;
     }
-    if ((!fan.presenceSysfsPath()) != (!fan.presenceGpio())) {
+    if ((!fan.presenceSysfsPath()) && (!fan.presenceGpio())) {
       XLOG(ERR) << "either presenceSysfsPath or presenceGpio must be set";
       return false;
     }