drivers/net/wireless/iwlwifi: remove exceptional & on function name

In this file, function names are otherwise used as pointers without &.

A simplified version of the semantic patch that makes this change is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@r@
identifier f;
@@

f(...) { ... }

@@
identifier r.f;
@@

- &f
+ f
// </smpl>
Signed-off-by: NJulia Lawall <julia@diku.dk>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/wireless/iwlwifi/iwl-3945-rs.c

@@ -355,7 +355,7 @@ static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband,
 
 	init_timer(&rs_sta->rate_scale_flush);
 	rs_sta->rate_scale_flush.data = (unsigned long)rs_sta;
-	rs_sta->rate_scale_flush.function = &iwl3945_bg_rate_scale_flush;
+	rs_sta->rate_scale_flush.function = iwl3945_bg_rate_scale_flush;
 
 	for (i = 0; i < IWL_RATE_COUNT_3945; i++)
 		iwl3945_clear_window(&rs_sta->win[i]);