Merge "Null check freezer on install failure"

                // TODO(patb): create a more descriptive reason than unknown in future release

                // mark all non-failure installs as UNKNOWN so we do not treat them as success

                for (InstallRequest request : requests) {

                    if (request.installResult.freezer != null) {

                        request.installResult.freezer.close();

                    }

                    if (request.installResult.returnCode == PackageManager.INSTALL_SUCCEEDED) {

                        request.installResult.returnCode = PackageManager.INSTALL_UNKNOWN;

                    }