drm/tegra: gr2d: Properly clean up resources

Failure to register the Tegra DRM client would leak the resources. Move
cleanup code to error unwinding gotos to fix that and share the cleanup
code with the other error paths.
Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/gpu/drm/tegra/gr2d.c

@@ -42,8 +42,9 @@ static int gr2d_init(struct host1x_client *client)
 
 	client->syncpts[0] = host1x_syncpt_request(client, flags);
 	if (!client->syncpts[0]) {
-		host1x_channel_put(gr2d->channel);
-		return -ENOMEM;
+		err = -ENOMEM;
+		dev_err(client->dev, "failed to request syncpoint: %d\n", err);
+		goto put;
 	}
 
 	if (tegra->domain) {
@@ -55,15 +56,30 @@ static int gr2d_init(struct host1x_client *client)
 				dev_err(client->dev,
 					"failed to attach to domain: %d\n",
 					err);
-				host1x_syncpt_free(client->syncpts[0]);
-				host1x_channel_put(gr2d->channel);
 				iommu_group_put(gr2d->group);
-				return err;
+				goto free;
 			}
 		}
 	}
 
-	return tegra_drm_register_client(tegra, drm);
+	err = tegra_drm_register_client(tegra, drm);
+	if (err < 0) {
+		dev_err(client->dev, "failed to register client: %d\n", err);
+		goto detach;
+	}
+
+	return 0;
+
+detach:
+	if (gr2d->group) {
+		iommu_detach_group(tegra->domain, gr2d->group);
+		iommu_group_put(gr2d->group);
+	}
+free:
+	host1x_syncpt_free(client->syncpts[0]);
+put:
+	host1x_channel_put(gr2d->channel);
+	return err;
 }
 
 static int gr2d_exit(struct host1x_client *client)