internal/github: pass nil to decode.Ordered to discard value

Change-Id: If7748b7d11a224ae6f3c1e2b021a6b16d0989c6b
Reviewed-on: https://go-review.googlesource.com/c/oscar/+/598355
Reviewed-by: Russ Cox <rsc@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Auto-Submit: Russ Cox <rsc@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
diff --git a/internal/github/sync.go b/internal/github/sync.go
index eb755b0..0d66e03 100644
--- a/internal/github/sync.go
+++ b/internal/github/sync.go
@@ -140,7 +140,7 @@
 	var errs []error
 	for key, _ := range c.db.Scan(o(syncProjectKind), o(syncProjectKind, ordered.Inf)) {
 		var project string
-		if err := ordered.Decode(key, new(string), &project); err != nil {
+		if err := ordered.Decode(key, nil, &project); err != nil {
 			c.db.Panic("github client sync decode", "key", storage.Fmt(key), "err", err)
 		}
 		if err := c.SyncProject(ctx, project); err != nil {