wifi: cfg80211: fix kernel-doc for wiphy_delayed_work_flush()

Now that I fixed the function name, we see the parameters
are wrong as well. Fix that too.

Change-Id: I1a4cfea446875998a5a242ca36acc8244991a199
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

include/net/cfg80211.h

@@ -5954,7 +5954,7 @@ void wiphy_delayed_work_cancel(struct wiphy *wiphy,
 /**
  * wiphy_delayed_work_flush - flush previously queued delayed work
  * @wiphy: the wiphy, for debug purposes
- * @work: the work to flush
+ * @dwork: the delayed work to flush
  *
  * Flush the work (i.e. run it if pending). This must be called
  * under the wiphy mutex acquired by wiphy_lock().