drm/amd/pm: Fix a memory leak on an error path

Add missing free on an error path.

Fixes: 511a9555 ("drm/amd/pm: Add SMU 13.0.6 support")
Reviewed-by: Yang Wang <kevinyang.wang@amd.com>
Signed-off-by: Kunwu.Chan <chentao@kylinos.cn>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_6_ppt.c

@@ -2035,8 +2035,10 @@ static ssize_t smu_v13_0_6_get_gpu_metrics(struct smu_context *smu, void **table
 
 	metrics = kzalloc(sizeof(MetricsTable_t), GFP_KERNEL);
 	ret = smu_v13_0_6_get_metrics_table(smu, metrics, true);
-	if (ret)
+	if (ret) {
+		kfree(metrics);
 		return ret;
+	}
 
 	smu_cmn_init_soft_gpu_metrics(gpu_metrics, 1, 4);