[Matrix]: fix a minor bug in mem_matrix_store.
[Matrix]: fix a minor bug in mem_matrix_store.

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