Fix some go vet warnings

mse/cmd/mse/main.go

@@ -28,12 +28,12 @@ func mainErr() error {
 			Address        string `arg:"positional"`
 			SecretKey      string `arg:"positional"`
 			InitialPayload []byte
-		} `arg:"subcommand""`
+		} `arg:"subcommand"`
 		Listen *struct {
 			Network    string   `arg:"positional"`
 			Address    string   `arg:"positional"`
 			SecretKeys []string `arg:"positional"`
-		} `arg:"subcommand""`
+		} `arg:"subcommand"`
 	}{
 		CryptoMethod: mse.AllSupportedCrypto,
 	}

test/issue377_test.go

@@ -119,12 +119,12 @@ func (me *diskFullStorage) Piece(p metainfo.Piece) storage.PieceImpl {
 	}
 }
 
-func (me diskFullStorage) Close() error {
+func (me *diskFullStorage) Close() error {
 	return nil
 }
 
-func (d diskFullStorage) OpenTorrent(info *metainfo.Info, infoHash metainfo.Hash) (storage.TorrentImpl, error) {
-	return &d, nil
+func (d *diskFullStorage) OpenTorrent(info *metainfo.Info, infoHash metainfo.Hash) (storage.TorrentImpl, error) {
+	return d, nil
 }
 
 type pieceImpl struct {

tracker/udp_test.go

@@ -186,6 +186,7 @@ func TestAnnounceRandomInfoHashThirdParty(t *testing.T) {
 		}(url)
 	}
 	wg.Wait()
+	cancel()
 }
 
 // Check that URLPath option is done correctly.