message: Fix two golint warnings
diff: @@ -53,7 +53,7 @@ type Graph struct {
  c *C.TF_Graph
  }
  -// Graph execution options
  +// The GraphImportOptions struct holds parameters for the ImportWithOptions function.
  type GraphImportOptions struct {
  // Node prefix
  Prefix string
  @@ -170,7 +170,7 @@ func (g *Graph) Operation(name string) *Operation {
  // Operations returns a list of all operations in the graph
  func (g *Graph) Operations() []Operation {
  - var pos C.size_t = 0
  + var pos C.size_t
  ops := []Operation{}
  for {
  cop := C.TF_GraphNextOperation(g.c, &pos)
  