unreachable code

/src/draco/io/gltf_encoder.cc line 3414
Code:
// Encode the geometry into a buffer.
EncoderBuffer buffer;
DRACO_RETURN_IF_ERROR(EncodeToBuffer(geometry, &gltf_asset, &buffer));
if (extension == "glb") {
return WriteGlbFile(gltf_asset, buffer, filename);
}
return WriteGltfFiles(gltf_asset, buffer, filename, bin_filename,
resource_dir);
return OkStatus(); /// <- unreachable
}