Reset read timeout to disabled in GetNameVersion

Fix a bug where the read timeout is not disabled if an error is
returned from ReadFrame (such as a timeout).

Thanks to Danny van Heumen <danny@dannyvanheumen.nl> for pointing this
out.

tkeyclient.go

@@ -171,19 +171,14 @@ func (tk TillitisKey) GetNameVersion() (*NameVersion, error) {
 		return nil, err
 	}
 
-	if err = tk.SetReadTimeout(2); err != nil {
-		return nil, err
-	}
+	tk.SetReadTimeoutNoErr(2)
+	defer tk.SetReadTimeoutNoErr(0)
 
 	rx, _, err := tk.ReadFrame(rspGetNameVersion, id)
 	if err != nil {
 		return nil, fmt.Errorf("ReadFrame: %w", err)
 	}
 
-	if err = tk.SetReadTimeout(0); err != nil {
-		return nil, fmt.Errorf("SetReadTimeout: %w", err)
-	}
-
 	nameVer := &NameVersion{}
 	nameVer.Unpack(rx[2:])