staging: wilc1000: fix incorrent type in initializer

Fix sparse warning:

drivers/staging/wilc1000//host_interface.c:444:49: warning: incorrect type in initializer (different address spaces)
drivers/staging/wilc1000//host_interface.c:444:49:    expected struct cfg80211_bss_ies const *ies
drivers/staging/wilc1000//host_interface.c:444:49:    got struct cfg80211_bss_ies const [noderef] <asn:4> *ies

Signed-off-by: Bo YU <tsu.yubo@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/host_interface.c

@@ -441,7 +441,7 @@ void *wilc_parse_join_bss_param(struct cfg80211_bss *bss,
 	const u8 *tim_elm, *ssid_elm, *rates_ie, *supp_rates_ie;
 	const u8 *ht_ie, *wpa_ie, *wmm_ie, *rsn_ie;
 	int ret;
-	const struct cfg80211_bss_ies *ies = bss->ies;
+	const struct cfg80211_bss_ies *ies = rcu_dereference(bss->ies);
 
 	param = kzalloc(sizeof(*param), GFP_KERNEL);
 	if (!param)