Remove stray KeepAlive, use new Close method to free RangeIterator resources

bindings/go/src/fdb/directory/directoryLayer.go

@@ -417,6 +417,7 @@ func (dl directoryLayer) subdirNames(rtr fdb.ReadTransaction, node subspace.Subs
 
 	rr := rtr.GetRange(sd, fdb.RangeOptions{})
 	ri := rr.Iterator()
+	defer ri.Close()
 
 	var ret []string
 
@@ -442,6 +443,7 @@ func (dl directoryLayer) subdirNodes(tr fdb.Transaction, node subspace.Subspace)
 
 	rr := tr.GetRange(sd, fdb.RangeOptions{})
 	ri := rr.Iterator()
+	defer ri.Close()
 
 	var ret []subspace.Subspace
 

bindings/go/src/fdb/fdb_test.go

@@ -246,6 +246,7 @@ func ExampleRangeIterator() {
 
 	rr := tr.GetRange(fdb.KeyRange{fdb.Key(""), fdb.Key{0xFF}}, fdb.RangeOptions{})
 	ri := rr.Iterator()
+	defer ri.Close()
 
 	// Advance will return true until the iterator is exhausted
 	for ri.Advance() {

bindings/go/src/fdb/futures.go

@@ -285,8 +285,6 @@ func stringRefToSlice(ptr unsafe.Pointer) []byte {
 }
 
 func (f *futureKeyValueArray) Get() ([]KeyValue, bool, error) {
-	defer runtime.KeepAlive(f.future)
-
 	f.BlockUntilReady()
 
 	var kvs *C.FDBKeyValue

bindings/go/src/fdb/range.go

@@ -140,6 +140,7 @@ func (rr RangeResult) GetSliceWithError() ([]KeyValue, error) {
 	var ret []KeyValue
 
 	ri := rr.Iterator()
+	defer ri.Close()
 
 	if rr.options.Limit != 0 {
 		ri.options.Mode = StreamingModeExact