Rename a 'shadowing' variable and remove an unused variable

These were issues reported by cppcheck.

src/HardwareSet/OpenXRSet/OpenXRSet.cpp

@@ -283,8 +283,8 @@ bool OpenXRSet::initOpenXRRuntime()
 	//====================
 
 	if (oxrConn.handTrackingEnabled) {
-		auto result = oxrHandTracking.create(oxrConn);
-		if (!oxrCheck(oxrConn, result, "[OpenXR] Disable hand tracking")) {
+		auto rtn = oxrHandTracking.create(oxrConn);
+		if (!oxrCheck(oxrConn, rtn, "[OpenXR] Disable hand tracking")) {
 			oxrConn.handTrackingEnabled = false;
 		}
 	}

src/HardwareSet/OpenXRSet/OpenXR_helpers.cpp

@@ -679,7 +679,6 @@ XrResult oxrSuggestBindings(const OxrConnection& oxrConn, const std::vector<XrAc
 
 void oxrGetPoseAction(const OxrConnection& oxrConn, const OxrAction* action, OxrPose& data, XrSpace& actionSpace)
 {
-	const OxrPoseAction* poseAction = reinterpret_cast<const OxrPoseAction*>(action);
 	data = std::nullopt;
 
 	XrActionStatePose handPoseState = { .type = XR_TYPE_ACTION_STATE_POSE, .next = nullptr };