mesh: Use correct rate in VHT and HT mixed environment

Let mesh STA A be a STA which has config disable_ht=0 and disable_vht=1.
Let mesh STA B be a STA which has config disable_ht=0 and disable_vht=0.
The mesh STA A and B was connected.

Previously, the mesh STA A sent frame with VHT rate even though its VHT
was disabled. This commit fixes the issue by checking the local BSS VHT
configuration.

Signed-off-by: Masashi Honma <masashi.honma@gmail.com>

src/ap/ieee802_11_vht.c

@@ -334,7 +334,7 @@ u16 copy_sta_vht_capab(struct hostapd_data *hapd, struct sta_info *sta,
 {
 	/* Disable VHT caps for STAs associated to no-VHT BSSes. */
 	if (!vht_capab ||
-	    hapd->conf->disable_11ac ||
+	    !hapd->iconf->ieee80211ac || hapd->conf->disable_11ac ||
 	    !check_valid_vht_mcs(hapd->iface->current_mode, vht_capab)) {
 		sta->flags &= ~WLAN_STA_VHT;
 		os_free(sta->vht_capabilities);