drm/amdgpu: refine sdma4 ras_data_cb

simplify code logic and refine return value

v2: remove unused error source code
Signed-off-by: Tao Zhou <tao.zhou1@amd.com>
Reviewed-by: Guchun Chen <guchun.chen@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c

@@ -1942,28 +1942,18 @@ static int sdma_v4_0_process_ras_data_cb(struct amdgpu_device *adev,
 		void *err_data,
 		struct amdgpu_iv_entry *entry)
 {
-	uint32_t err_source;
 	int instance;
 
-	if (!amdgpu_ras_is_supported(adev, AMDGPU_RAS_BLOCK__GFX)) {
+	if (amdgpu_ras_is_supported(adev, AMDGPU_RAS_BLOCK__GFX))
+		goto out;
+
 	instance = sdma_v4_0_irq_id_to_seq(entry->client_id);
 	if (instance < 0)
-			return 0;
-
-		switch (entry->src_id) {
-		case SDMA0_4_0__SRCID__SDMA_SRAM_ECC:
-			err_source = 0;
-			break;
-		case SDMA0_4_0__SRCID__SDMA_ECC:
-			err_source = 1;
-			break;
-		default:
-			return 0;
-		}
+		goto out;
 
 	amdgpu_sdma_process_ras_data_cb(adev, err_data, entry);
-	}
 
+out:
 	return AMDGPU_RAS_SUCCESS;
 }