vendor: Update golang.org/cznic/...

vendor/github.com/cznic/ql/file.go

@@ -19,9 +19,9 @@ import (
 	"sync"
 	"time"
 
+	"github.com/cznic/lldb"
 	"github.com/cznic/mathutil"
 	"github.com/cznic/ql/vendored/github.com/camlistore/go4/lock"
-	"github.com/cznic/ql/vendored/github.com/cznic/exp/lldb"
 )
 
 const (
@@ -409,7 +409,7 @@ func newFileFromOSFile(f lldb.OSFile) (fi *file, err error) {
 	w, err = os.OpenFile(wn, os.O_CREATE|os.O_EXCL|os.O_RDWR, 0666)
 	closew = true
 	defer func() {
-		if closew {
+		if w != nil && closew {
 			nm := w.Name()
 			w.Close()
 			os.Remove(nm)