rt2x00: Only set the TBCN flag when the interface is configured to send beacons.

These flags used to be fixed to one in rt2500pci_config_type, which
caused the beacon timer interrupt to fire. This would lead to
rt2x00lib_beacondone adding work which called
rt2x00lib_beacondone_scheduled which called ieee80211_beacon_get which
printed an error about not having any beacon data.

With this patch, these interrupts are only generated when the interface
is configured to send beacons.

Signed-off-by: Matthijs Kooijman <matthijs@stdin.nl>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rt2x00/rt2400pci.c b/drivers/net/wireless/rt2x00/rt2400pci.c
index c9a234f..9eed9e9 100644
--- a/drivers/net/wireless/rt2x00/rt2400pci.c
+++ b/drivers/net/wireless/rt2x00/rt2400pci.c
@@ -280,7 +280,7 @@
 	 */
 	rt2x00pci_register_read(rt2x00dev, CSR14, &reg);
 	rt2x00_set_field32(&reg, CSR14_TSF_COUNT, 1);
-	rt2x00_set_field32(&reg, CSR14_TBCN, 1);
+	rt2x00_set_field32(&reg, CSR14_TBCN, (tsf_sync == TSF_SYNC_BEACON));
 	rt2x00_set_field32(&reg, CSR14_BEACON_GEN, 0);
 	rt2x00_set_field32(&reg, CSR14_TSF_SYNC, tsf_sync);
 	rt2x00pci_register_write(rt2x00dev, CSR14, reg);