Below is the error log:
ERROR: Patch can't be applied/reverted successfully. patching file app/code/core/Mage/Admin/Model/Session.php patching file app/code/core/Mage/Adminhtml/Block/Checkout/Formkey.php patching file app/code/core/Mage/Adminhtml/Block/Notification/Symlink.php patching file app/code/core/Mage/Adminhtml/Block/Widget/Grid/Column/Filter/Date.php patching file app/code/core/Mage/Adminhtml/Model/Config/Data.php patching file app/code/core/Mage/Adminhtml/controllers/Catalog/Product/GalleryController.php patching file app/code/core/Mage/Checkout/controllers/MultishippingController.php patching file app/code/core/Mage/Checkout/controllers/OnepageController.php Hunk #1 succeeded at 350 (offset 1 line). Hunk #2 succeeded at 370 (offset 1 line). Hunk #3 succeeded at 417 (offset 1 line). Hunk #4 succeeded at 446 (offset 1 line). Hunk #5 succeeded at 485 (offset 1 line). patching file app/code/core/Mage/Checkout/etc/system.xml patching file app/code/core/Mage/Cms/Model/Wysiwyg/Images/Storage.php Hunk #1 succeeded at 282 (offset -1 lines). patching file app/code/core/Mage/Core/Controller/Front/Action.php patching file app/code/core/Mage/Core/Controller/Request/Http.php patching file app/code/core/Mage/Core/Model/File/Validator/Image.php patching file app/code/core/Mage/Core/etc/system.xml patching file app/code/core/Mage/Customer/Model/Session.php patching file app/code/core/Mage/Dataflow/Model/Convert/Adapter/Zend/Cache.php patching file app/code/core/Mage/Dataflow/Model/Convert/Container/Abstract.php patching file app/code/core/Mage/Dataflow/Model/Convert/Parser/Csv.php patching file app/code/core/Mage/Dataflow/Model/Convert/Parser/Xml/Excel.php patching file app/code/core/Mage/ImportExport/Model/Import/Uploader.php patching file app/code/core/Mage/Sales/Model/Quote/Item.php Hunk #1 FAILED at 500. 1 out of 1 hunk FAILED -- saving rejects to file app/code/core/Mage/Sales/Model/Quote/Item.php.rej patching file app/code/core/Mage/Widget/Model/Widget/Instance.php patching file app/code/core/Mage/XmlConnect/Helper/Image.php patching file app/code/core/Mage/XmlConnect/controllers/Adminhtml/MobileController.php patching file app/design/adminhtml/default/default/layout/main.xml patching file app/design/adminhtml/default/default/template/notification/formkey.phtml patching file app/design/adminhtml/default/default/template/notification/symlink.phtml patching file app/design/adminhtml/default/default/template/page/head.phtml patching file app/design/frontend/base/default/template/checkout/cart/shipping.phtml patching file app/design/frontend/base/default/template/checkout/multishipping/billing.phtml patching file app/design/frontend/base/default/template/checkout/multishipping/shipping.phtml patching file app/design/frontend/base/default/template/checkout/onepage/billing.phtml patching file app/design/frontend/base/default/template/checkout/onepage/payment.phtml Hunk #1 succeeded at 35 (offset -1 lines). patching file app/design/frontend/base/default/template/checkout/onepage/shipping.phtml patching file app/design/frontend/base/default/template/checkout/onepage/shipping_method.phtml patching file app/design/frontend/base/default/template/persistent/checkout/onepage/billing.phtml patching file app/design/frontend/rwd/default/layout/page.xml patching file app/design/frontend/rwd/default/template/checkout/cart/shipping.phtml patching file app/design/frontend/rwd/default/template/checkout/multishipping/addresses.phtml patching file app/design/frontend/rwd/default/template/checkout/multishipping/billing.phtml patching file app/design/frontend/rwd/default/template/checkout/onepage/payment.phtml Hunk #1 succeeded at 36 (offset -1 lines). patching file app/design/frontend/rwd/default/template/checkout/onepage/shipping.phtml patching file app/design/frontend/rwd/default/template/persistent/checkout/onepage/billing.phtml patching file app/etc/config.xml patching file app/locale/en_US/Mage_Adminhtml.csv Hunk #1 succeeded at 1281 (offset -4 lines). patching file app/locale/en_US/Mage_Core.csv Hunk #1 succeeded at 404 (offset -3 lines). patching file app/locale/en_US/Mage_Dataflow.csv patching file app/locale/en_US/Mage_XmlConnect.csv patching file downloader/Maged/Connect.php patching file downloader/Maged/Controller.php Hunk #1 succeeded at 417 (offset -4 lines). Hunk #2 succeeded at 964 (offset -15 lines). patching file downloader/Maged/Model/Session.php Hunk #1 succeeded at 82 with fuzz 2. Hunk #2 succeeded at 268 (offset -5 lines). patching file js/lib/jquery/jquery-1.12.0.js patching file js/lib/jquery/jquery-1.12.0.min.js patching file js/lib/jquery/jquery-1.12.0.min.map patching file js/varien/payment.js patching file skin/frontend/base/default/js/opcheckout.js Hunk #1 succeeded at 711 (offset 27 lines). I have confirmed that app/code/core/Mage/Sales/Model/Quote/Item.php core file is unchanged. Still, the patch is giving error.