drm/amd/pm: Remove redundant check condition

V3:
[Why]:
  Since ASICs using smu v13_0_2 have called smu
.suspend before calling amdgpu_pm_sysfs_fini,
pm.dpm_enabled was already set to 0 when smu
.suspend was called. This makes it impossible
to delete all pm sys nodes.

[How]:
  Since all functions in amdgpu_pm_sysfs_fini
have their own condition checks, so the first
conditional check in amdgpu_pm_sysfs_fini can
be removed.
Signed-off-by: YiPeng Chai <YiPeng.Chai@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/pm/amdgpu_pm.c

@@ -3405,9 +3405,6 @@ int amdgpu_pm_sysfs_init(struct amdgpu_device *adev)
 
 void amdgpu_pm_sysfs_fini(struct amdgpu_device *adev)
 {
-	if (adev->pm.dpm_enabled == 0)
-		return;
-
 	if (adev->pm.int_hwmon_dev)
 		hwmon_device_unregister(adev->pm.int_hwmon_dev);