close input streams obtained from otacerts zip file

import java.io.FileNotFoundException;

import java.io.FileWriter;

import java.io.IOException;

import java.io.InputStream;

import java.io.RandomAccessFile;

import java.security.GeneralSecurityException;

import java.security.PublicKey;

            Enumeration<? extends ZipEntry> entries = zip.entries();

            while (entries.hasMoreElements()) {

                ZipEntry entry = entries.nextElement();

                trusted.add(cf.generateCertificate(zip.getInputStream(entry)));

                InputStream is = zip.getInputStream(entry);

                try {

                    trusted.add(cf.generateCertificate(is));

                } finally {

                    is.close();

                }

            }

        } finally {

            zip.close();

            int commentSize = (footer[4] & 0xff) | ((footer[5] & 0xff) << 8);

            int signatureStart = (footer[0] & 0xff) | ((footer[1] & 0xff) << 8);

            Log.v(TAG, String.format("comment size %d; signature start %d",

                                     commentSize, signatureStart));

            byte[] eocd = new byte[commentSize + 22];

            raf.seek(fileLen - (commentSize + 22));