carl9170: Remove casts of pointer to same type

Casting a pointer to a pointer of the same type is pointless,
so remove these unnecessary casts.

Done via coccinelle script:

$ cat typecast_2.cocci
@@
type T;
T *foo;
@@

-	(T *)foo
+	foo
Signed-off-by: NJoe Perches <joe@perches.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/carl9170/rx.c

@@ -572,7 +572,7 @@ static void carl9170_ps_beacon(struct ar9170 *ar, void *data, unsigned int len)
 
 static void carl9170_ba_check(struct ar9170 *ar, void *data, unsigned int len)
 {
-	struct ieee80211_bar *bar = (void *) data;
+	struct ieee80211_bar *bar = data;
 	struct carl9170_bar_list_entry *entry;
 	unsigned int queue;