Avoid StrictMode error in OpenPgpApi

E/StrictMode(9278): A resource was acquired at attached stack trace but never released. See java.io.Closeable for information on avoiding resource leaks.
E/StrictMode(9278): java.lang.Throwable: Explicit termination method 'close' not called
E/StrictMode(9278): 	at dalvik.system.CloseGuard.open(CloseGuard.java:184)
E/StrictMode(9278): 	at android.os.ParcelFileDescriptor.<init>(ParcelFileDescriptor.java:179)
E/StrictMode(9278): 	at android.os.ParcelFileDescriptor.<init>(ParcelFileDescriptor.java:168)
E/StrictMode(9278): 	at android.os.ParcelFileDescriptor.createPipe(ParcelFileDescriptor.java:362)
E/StrictMode(9278): 	at org.openintents.openpgp.util.ParcelFileDescriptorUtil.pipeFrom(ParcelFileDescriptorUtil.java:34)
E/StrictMode(9278): 	at org.openintents.openpgp.util.OpenPgpApi.executeApi(OpenPgpApi.java:222)
E/StrictMode(9278): 	at org.openintents.openpgp.util.OpenPgpApi$OpenPgpAsyncTask.doInBackground(OpenPgpApi.java:189)
E/StrictMode(9278): 	at org.openintents.openpgp.util.OpenPgpApi$OpenPgpAsyncTask.doInBackground(OpenPgpApi.java:1)
E/StrictMode(9278): 	at android.os.AsyncTask$2.call(AsyncTask.java:288)
E/StrictMode(9278): 	at java.util.concurrent.FutureTask.run(FutureTask.java:237)
E/StrictMode(9278): 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
E/StrictMode(9278): 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
E/StrictMode(9278): 	at java.lang.Thread.run(Thread.java:841)