drm/amdkfd: CRIU fix a NULL vs IS_ERR() check

The kfd_process_device_data_by_id() does not return error pointers,
it returns NULL.

Fixes: bef153b7 ("drm/amdkfd: CRIU implement gpu_id remapping")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: David Yat Sin <david.yatsin@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdkfd/kfd_chardev.c

@@ -2252,7 +2252,7 @@ static int criu_restore_bos(struct kfd_process *p,
 				break;
 
 			peer_pdd = kfd_process_device_data_by_id(p, bo_priv->mapped_gpuids[j]);
-			if (IS_ERR(peer_pdd)) {
+			if (!peer_pdd) {
 				ret = -EINVAL;
 				goto exit;
 			}