staging: wfx: disabling keep alive during unjoin is useless

After a call to hif_reset(), the parameters associated with BSS are
reset. So, it useless to explicitly reset the keep alive period.
Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200410133239.438347-10-Jerome.Pouiller@silabs.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wfx/sta.c

@@ -413,7 +413,6 @@ static void wfx_do_unjoin(struct wfx_vif *wvif)
 
 	/* Unjoin is a reset. */
 	wfx_tx_lock_flush(wvif->wdev);
-	hif_keep_alive_period(wvif, 0);
 	hif_reset(wvif, false);
 	wfx_tx_policy_init(wvif);
 	hif_set_macaddr(wvif, wvif->vif->addr);