stream/mts/meta/meta.go: reduced verbosity of local vars in meta.Keys

stream/mts/meta/meta.go

@@ -166,15 +166,15 @@ func (m *Data) Encode() []byte {
 
 // Keys returns all keys in a slice of metadata d.
 func Keys(d []byte) ([]string, error) {
-	tmp, err := GetAll(d)
+	m, err := GetAll(d)
 	if err != nil {
 		return nil, err
 	}
-	keys := make([]string, len(tmp))
-	for i, entry := range tmp {
-		keys[i] = entry[0]
+	k := make([]string, len(m))
+	for i, kv := range m {
+		k[i] = kv[0]
 	}
-	return keys, nil
+	return k, nil
 }
 
 // Get returns the value for the given key in d.