Clean up security token transport if connection procedure failed

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/securitytoken/SecurityTokenConnection.java

@@ -103,6 +103,7 @@ public class SecurityTokenConnection {
      */
     @VisibleForTesting
     void connectToDevice(Context context) throws IOException {
+        try {
             // Connect on transport layer
             transport.connect();
 
@@ -125,6 +126,10 @@ public class SecurityTokenConnection {
             isPw3Validated = false;
 
             smEstablishIfAvailable(context);
+        } catch (IOException e) {
+            transport.release();
+            throw e;
+        }
     }
 
     @VisibleForTesting