[R]: fix a bug in fm.conv.FM2R.
[R]: fix a bug in fm.conv.FM2R.

flashxio/FlashX,icoming/FlashX,icoming/FlashGraph,zheng-da/FlashX,icoming/FlashX,icoming/FlashGraph,flashxio/FlashX,zheng-da/FlashX,flashxio/FlashX,icoming/FlashX,icoming/FlashX,flashxio/FlashX,icoming/FlashX,flashxio/FlashX,icoming/FlashGraph,zheng-da/FlashX,flashxio/FlashX,icoming/FlashGraph,zheng-da/FlashX,icoming/FlashGraph,zheng-da/FlashX