drm/amd/pm: Correct msg status check for powerlimit

Status 0 indicates success, fix the check before using PPTable limit
Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Kevin Wang <kevin1.wang@amd.com>`
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/pm/swsmu/smu13/aldebaran_ppt.c

@@ -1072,7 +1072,7 @@ static int aldebaran_get_power_limit(struct smu_context *smu)
 
 	ret = smu_cmn_send_smc_msg(smu, SMU_MSG_GetPptLimit, &power_limit);
 
-	if (!ret) {
+	if (ret) {
 		/* the last hope to figure out the ppt limit */
 		if (!pptable) {
 			dev_err(smu->adev->dev, "Cannot get PPT limit due to pptable missing!");