Fix tiny bug with handling of big files
Fix tiny bug with handling of big files

The bug was introduced in the previous commit

EnjoyHacking/faster-rnnlm,EnjoyHacking/faster-rnnlm,evilmucedin/faster-rnnlm,yandex/faster-rnnlm,yanqingmen/faster-rnnlm,evilmucedin/faster-rnnlm,yanqingmen/faster-rnnlm,yandex/faster-rnnlm,yanqingmen/faster-rnnlm,evilmucedin/faster-rnnlm,EnjoyHacking/faster-rnnlm,yandex/faster-rnnlm