zd1211rw: stop beacons on remove_interface

If a mesh or ad-hoc interface is brought up and later it is replaced
by managed interface, the managed interface will keep transmitting
the beacons that were configured for the former interface. This patch
fixes that behaviour.
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/zd1211rw/zd_mac.c

@@ -765,6 +765,7 @@ static void zd_op_remove_interface(struct ieee80211_hw *hw,
 {
 	struct zd_mac *mac = zd_hw_mac(hw);
 	mac->type = IEEE80211_IF_TYPE_INVALID;
+	zd_set_beacon_interval(&mac->chip, 0);
 	zd_write_mac_addr(&mac->chip, NULL);
 }