drm/amdgpu: fix uninit-value in arcturus_log_thermal_throttling_event()

when function arcturus_get_smu_metrics_data() call failed,
it will cause the variable "throttler_status" isn't initialized before use.

warning:
powerplay/arcturus_ppt.c:2268:24: warning: ‘throttler_status’ may be used uninitialized in this function [-Wmaybe-uninitialized]
 2268 |   if (throttler_status & logging_label[throttler_idx].feature_mask) {
Signed-off-by: Kevin Wang <kevin1.wang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/arcturus_ppt.c

@@ -2204,14 +2204,17 @@ static const struct throttling_logging_label {
 };
 static void arcturus_log_thermal_throttling_event(struct smu_context *smu)
 {
+	int ret;
 	int throttler_idx, throtting_events = 0, buf_idx = 0;
 	struct amdgpu_device *adev = smu->adev;
 	uint32_t throttler_status;
 	char log_buf[256];
 
-	arcturus_get_smu_metrics_data(smu,
+	ret = arcturus_get_smu_metrics_data(smu,
 					    METRICS_THROTTLER_STATUS,
 					    &throttler_status);
+	if (ret)
+		return;
 
 	memset(log_buf, 0, sizeof(log_buf));
 	for (throttler_idx = 0; throttler_idx < ARRAY_SIZE(logging_label);