[R]: fix a bug in constructing a sym sparse matrix on SAFS.
[R]: fix a bug in constructing a sym sparse matrix on SAFS.

icoming/FlashX,flashxio/FlashX,icoming/FlashX,flashxio/FlashX,flashxio/FlashX,flashxio/FlashX,flashxio/FlashX,icoming/FlashX,flashxio/FlashX,icoming/FlashX,icoming/FlashX