staging: brcm80211: use correct pointer types in bcm_pktq_flush

to clarify the intention:

On Sun, May 15, 2011 at 09:54:26PM +0200, Arend van Spriel wrote:
> On 05/15/2011 08:10 PM, Hauke Mehrtens wrote:
[...]
>> Why don't you use the correct pointer type here instead of casting then
>> around and the parameter names are meaningless too.
>>
>> static bool cb_del_ampdu_pkt(struct sk_buff *mpdu, struct
>> cb_del_ampdu_pars *ampdu_pars)
[...]
> Actually this is a generic callback mechanism in which an additional
> parameter can be passed, which can be of *any* type hence a void pointer
> seems justified here and a meaningless name is used. I do agree that the
> txi parameter will always be a struct sk_buff and should be indicated as
> such.
Reported-by: NHauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: NClemens Noss <cnoss@gmx.de>
Acked-by: NRoland Vossen <rvossen@broadcom.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/brcm80211/brcmsmac/wlc_ampdu.c

@@ -1204,9 +1204,8 @@ void wlc_ampdu_shm_upd(struct ampdu_info *ampdu)
 /*
  * callback function that helps flushing ampdu packets from a priority queue
  */
-static bool cb_del_ampdu_pkt(void *p, void *arg_a)
+static bool cb_del_ampdu_pkt(struct sk_buff *mpdu, void *arg_a)
 {
-	struct sk_buff *mpdu = (struct sk_buff *)p;
 	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(mpdu);
 	struct cb_del_ampdu_pars *ampdu_pars =
 				 (struct cb_del_ampdu_pars *)arg_a;

drivers/staging/brcm80211/include/bcmutils.h

@@ -74,7 +74,7 @@
 #define PKTQ_PREC_ITER(pq, prec)        for (prec = (pq)->num_prec - 1; prec >= 0; prec--)
 
 /* fn(pkt, arg).  return true if pkt belongs to if */
-	typedef bool(*ifpkt_cb_t) (void *, void *);
+typedef bool(*ifpkt_cb_t) (struct sk_buff *, void *);
 
 /* operations on a specific precedence in packet queue */