staging: wfx: drop useless checks in wfx_do_unjoin()

The callers of wfx_do_unjoin() already take care of vif state.
Therefore, it is not necessary to take care of the status of the
interface.
Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200420160311.57323-14-Jerome.Pouiller@silabs.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wfx/sta.c

@@ -286,12 +286,6 @@ void wfx_set_default_unicast_key(struct ieee80211_hw *hw,
 // Call it with wdev->conf_mutex locked
 static void wfx_do_unjoin(struct wfx_vif *wvif)
 {
-	if (!wvif->state)
-		return;
-
-	if (wvif->state == WFX_STATE_AP)
-		return;
-
 	wvif->state = WFX_STATE_PASSIVE;
 
 	/* Unjoin is a reset. */