iwlwifi: iwl-agn-rs.c: remove old comment

this comment refers to some code that was removed.
Signed-off-by: NGreg Dietsche <Gregory.Dietsche@cuw.edu>
Signed-off-by: NWey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

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

@@ -2214,7 +2214,6 @@ static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
 
 /*
  * setup rate table in uCode
- * return rate_n_flags as used in the table
  */
 static void rs_update_rate_tbl(struct iwl_priv *priv,
 			       struct iwl_rxon_context *ctx,