Merge "Don't crash when backup timeout races with agent completion"

        @Override

        public void operationComplete() {

            // Okay, the agent successfully reported back to us!

            // The agent reported back to us!

            if (mBackupData == null) {

                // This callback was racing with our timeout, so we've cleaned up the

                // agent state already and are on to the next thing.  We have nothing

                // further to do here: agent state having been cleared means that we've

                // initiated the appropriate next operation.

                final String pkg = (mCurrentPackage != null)

                        ? mCurrentPackage.packageName : "[none]";

                if (DEBUG) {

                    Slog.i(TAG, "Callback after agent teardown: " + pkg);

                }

                addBackupTrace("late opComplete; curPkg = " + pkg);

                return;

            }

            final String pkgName = mCurrentPackage.packageName;

            final long filepos = mBackupDataName.length();

            FileDescriptor fd = mBackupData.getFileDescriptor();