iwlwifi: mvm: remove unused .remove_sta_debugfs callback

The .remove_sta_debugfs callback was not doing anything in this driver,
so remove it as it is not needed.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20190612142658.12792-4-gregkh@linuxfoundation.orgSigned-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/intel/iwlwifi/mvm/rs.c

@@ -4093,10 +4093,6 @@ static void rs_drv_add_sta_debugfs(void *mvm, void *priv_sta,
 
 	MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, 0600);
 }
-
-void rs_remove_sta_debugfs(void *mvm, void *mvm_sta)
-{
-}
 #endif
 
 /*
@@ -4124,7 +4120,6 @@ static const struct rate_control_ops rs_mvm_ops_drv = {
 	.rate_update = rs_drv_rate_update,
 #ifdef CONFIG_MAC80211_DEBUGFS
 	.add_sta_debugfs = rs_drv_add_sta_debugfs,
-	.remove_sta_debugfs = rs_remove_sta_debugfs,
 #endif
 	.capa = RATE_CTRL_CAPA_VHT_EXT_NSS_BW,
 };