wifi: rndis_wlan: clean up a type issue

The rndis_bss_info_update() returns type bool.  Change the NULL
returns to false.
Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/d1f250a3-653a-497d-9c92-12dd628b7927@kili.mountain

drivers/net/wireless/legacy/rndis_wlan.c

@@ -1972,7 +1972,7 @@ static bool rndis_bss_info_update(struct usbnet *usbdev,
 
 	if (bssid_len < sizeof(struct ndis_80211_bssid_ex) +
 			sizeof(struct ndis_80211_fixed_ies))
-		return NULL;
+		return false;
 
 	fixed = (struct ndis_80211_fixed_ies *)bssid->ies;
 
@@ -1981,13 +1981,13 @@ static bool rndis_bss_info_update(struct usbnet *usbdev,
 					(int)le32_to_cpu(bssid->ie_length));
 	ie_len -= sizeof(struct ndis_80211_fixed_ies);
 	if (ie_len < 0)
-		return NULL;
+		return false;
 
 	/* extract data for cfg80211_inform_bss */
 	channel = ieee80211_get_channel(priv->wdev.wiphy,
 			KHZ_TO_MHZ(le32_to_cpu(bssid->config.ds_config)));
 	if (!channel)
-		return NULL;
+		return false;
 
 	signal = level_to_qual(le32_to_cpu(bssid->rssi));
 	timestamp = le64_to_cpu(*(__le64 *)fixed->timestamp);