nl80211: Fix the size of the maximum MAC ACL size

NL80211_ATTR_MAC_ACL_MAX is a u32 attribute to advertise the maximum
number of MAC addresses that a device can support for MAC ACL. This was
incorrectly used as a u8 attribute which would not work with any values
larger than 255 or on big endian CPUs. Fix this by moving from
nla_get_u8() to nla_get_u32().

Fixes: 3c4ca36330 ("hostapd: Support MAC address based access control list")
Signed-off-by: Jouni Malinen <jouni@codeaurora.org>

src/drivers/driver_nl80211_capa.c

@@ -891,7 +891,7 @@ static int wiphy_info_handler(struct nl_msg *msg, void *arg)
 
 	if (tb[NL80211_ATTR_MAC_ACL_MAX])
 		capa->max_acl_mac_addrs =
-			nla_get_u8(tb[NL80211_ATTR_MAC_ACL_MAX]);
+			nla_get_u32(tb[NL80211_ATTR_MAC_ACL_MAX]);
 
 	wiphy_info_supported_iftypes(info, tb[NL80211_ATTR_SUPPORTED_IFTYPES]);
 	wiphy_info_iface_comb(info, tb[NL80211_ATTR_INTERFACE_COMBINATIONS]);