vfio: fix a typo in comment of function vfio_pin_pages

Correct the description that 'unpinned' -> 'pinned'.

Signed-off-by: Changbin Du <changbin.du@intel.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 57052b6..609f4f9 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -1917,7 +1917,7 @@
  * Pin a set of guest PFNs and return their associated host PFNs for local
  * domain only.
  * @dev [in]     : device
- * @user_pfn [in]: array of user/guest PFNs to be unpinned.
+ * @user_pfn [in]: array of user/guest PFNs to be pinned.
  * @npage [in]   : count of elements in user_pfn array.  This count should not
  *		   be greater VFIO_PIN_PAGES_MAX_ENTRIES.
  * @prot [in]    : protection flags