Fix a bug in the test program.
Fix a bug in the test program.

We need to increase num_pending before access() is called because cached
IO may complete a request inside access().

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