fix runtime assert to assert if !expr...
fix runtime assert to assert if !expr...

welp, that's a bit embarrasing.  Also print out a more meaningful
message.

zhakui/libphenom,ChinaLongGanHu/libphenom,yangjin-unique/libphenom,guiquanz/libphenom,seem-sky/libphenom,dailypips/libphenom,rogerchina/libphenom,ChinaLongGanHu/libphenom,rogerchina/libphenom,zhakui/libphenom,sakishum/libphenom,rogerchina/libphenom,dailypips/libphenom,guiquanz/libphenom,zhenglaizhang/libphenom,sakishum/libphenom,guiquanz/libphenom,facebook/libphenom,mhaberler/libphenom,guiquanz/libphenom,zhakui/libphenom,yangjin-unique/libphenom,facebook/libphenom,facebook/libphenom,rogerchina/libphenom,yangjin-unique/libphenom,sakishum/libphenom,zhenglaizhang/libphenom,seem-sky/libphenom,seem-sky/libphenom,mhaberler/libphenom,sakishum/libphenom,yangjin-unique/libphenom,guiquanz/libphenom,seem-sky/libphenom,guiquanz/libphenom,ChinaLongGanHu/libphenom,sakishum/libphenom,guiquanz/libphenom,dailypips/libphenom,zhakui/libphenom,seem-sky/libphenom,ChinaLongGanHu/libphenom,zhenglaizhang/libphenom,zhenglaizhang/libphenom,mhaberler/libphenom,facebook/libphenom,facebook/libphenom,mhaberler/libphenom,ChinaLongGanHu/libphenom,zhakui/libphenom,mhaberler/libphenom,yangjin-unique/libphenom,zhenglaizhang/libphenom,dailypips/libphenom,dailypips/libphenom,rogerchina/libphenom