Fix a compilation error when DEBUG is enabled.
Fix a compilation error when DEBUG is enabled.

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