drm/amdgpu: fix adev variable used in amdgpu_device_gpu_recover()

Use the correct adev variable for the drm_fb_helper in
amdgpu_device_gpu_recover().  Noticed by inspection.

Fixes: 087451f3 ("drm/amdgpu: use generic fb helpers instead of setting up AMD own's.")
Reviewed-by: Guchun Chen <guchun.chen@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

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

@@ -5164,7 +5164,7 @@ int amdgpu_device_gpu_recover_imp(struct amdgpu_device *adev,
 		 */
 		amdgpu_unregister_gpu_instance(tmp_adev);
 
-		drm_fb_helper_set_suspend_unlocked(adev_to_drm(adev)->fb_helper, true);
+		drm_fb_helper_set_suspend_unlocked(adev_to_drm(tmp_adev)->fb_helper, true);
 
 		/* disable ras on ALL IPs */
 		if (!need_emergency_restart &&