staging: wfx: drop useless update of macaddr

Mac address is set in wfx_add_interface() and removed in
wfx_remove_interface().

Currently, there is also an additional update of mac address in
wfx_do_unjoin(). It has no rationale. Mac address is already present
and nothing has changed it. Therefore, we can drop it.
Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200410133239.438347-20-Jerome.Pouiller@silabs.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wfx/sta.c

@@ -415,7 +415,6 @@ static void wfx_do_unjoin(struct wfx_vif *wvif)
 	wfx_tx_lock_flush(wvif->wdev);
 	hif_reset(wvif, false);
 	wfx_tx_policy_init(wvif);
-	hif_set_macaddr(wvif, wvif->vif->addr);
 	if (wvif_count(wvif->wdev) <= 1)
 		hif_set_block_ack_policy(wvif, 0xFF, 0xFF);
 	wfx_free_event_queue(wvif);