mac80211: remove module handling from rate control ops

There's not a single rate control algorithm actually in
a separate module where the module refcount would be
required. Similarly, there's no specific rate control
module.

Therefore, all the module handling code in rate control
is really just dead code, so remove it.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/iwlegacy/3945-rs.c

@@ -892,7 +892,6 @@ il3945_rs_rate_init_stub(void *il_r, struct ieee80211_supported_band *sband,
 }
 
 static const struct rate_control_ops rs_ops = {
-	.module = NULL,
 	.name = RS_NAME,
 	.tx_status = il3945_rs_tx_status,
 	.get_rate = il3945_rs_get_rate,