drm/amd/powerplay: rewrite pp_sw_init to make code readable

Actually, pp_sw_init executes pptable_init and backend_init orderly if
they are initialized successfully. So rewrite it to make code more
readable.
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NHuang Rui <ray.huang@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

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

@@ -68,15 +68,18 @@ static int pp_sw_init(void *handle)
 		return -EINVAL;
 
 	ret = hwmgr->pptable_func->pptable_init(hwmgr);
+	if (ret)
+		goto err;
 
-	if (ret == 0)
-		ret = hwmgr->hwmgr_func->backend_init(hwmgr);
-
+	ret = hwmgr->hwmgr_func->backend_init(hwmgr);
 	if (ret)
-		printk(KERN_ERR "amdgpu: powerplay initialization failed\n");
-	else
-		printk(KERN_INFO "amdgpu: powerplay initialized\n");
+		goto err;
 
+	pr_info("amdgpu: powerplay initialized\n");
+
+	return 0;
+err:
+	pr_err("amdgpu: powerplay initialization failed\n");
 	return ret;
 }