drm/amdgpu: Free ras cmd input buffer properly

Do not access the pointer for ras input cmd buffer
if it is even not allocated.
Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Stanley Yang <Stanley.Yang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c

@@ -764,7 +764,7 @@ int amdgpu_ras_feature_enable(struct amdgpu_device *adev,
 {
 	struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
 	union ta_ras_cmd_input *info;
-	int ret = 0;
+	int ret;
 
 	if (!con)
 		return -EINVAL;
@@ -773,7 +773,7 @@ int amdgpu_ras_feature_enable(struct amdgpu_device *adev,
 	if (enable &&
 	    head->block != AMDGPU_RAS_BLOCK__GFX &&
 	    !amdgpu_ras_is_feature_allowed(adev, head))
-		goto out;
+		return 0;
 
 	/* Only enable gfx ras feature from host side */
 	if (head->block == AMDGPU_RAS_BLOCK__GFX &&
@@ -801,16 +801,16 @@ int amdgpu_ras_feature_enable(struct amdgpu_device *adev,
 				enable ? "enable":"disable",
 				get_ras_block_str(head),
 				amdgpu_ras_is_poison_mode_supported(adev), ret);
-			goto out;
+			return ret;
 		}
+
+		kfree(info);
 	}
 
 	/* setup the obj */
 	__amdgpu_ras_feature_enable(adev, head, enable);
-out:
-	if (head->block == AMDGPU_RAS_BLOCK__GFX)
-		kfree(info);
-	return ret;
+
+	return 0;
 }
 
 /* Only used in device probe stage and called only once. */