Remove unused variables/types/functions

[staticcheck](https://staticcheck.io/) reported a number of unused
fields, functions, types, and variables across the code.

Where possible, use them (assert unchecked errors in tests, for example)
and otherwise remove them.

1 files changed, 1 insertions, 1 deletions

diff --git a/remote.go b/remote.go
index 426bde9..d54693e 100644
--- a/remote.go
+++ b/remote.go
@@ -256,7 +256,7 @@ func (r *Remote) addReachableTags(localRefs []*plumbing.Reference, remoteRefs st
 		return err
 	}
 
-	for tag, _ := range tags {
+	for tag := range tags {
 		tagObject, err := object.GetObject(r.s, tag.Hash())
 		var tagCommit *object.Commit
 		if err != nil {