rt2x00: allow txstatus_fifo w/o txstatus_tasklet

When DRIVER_REQUIRE_TXSTATUS_FIFO is set, intialize the
txstatus_fifo, but initialize rt2x00dev->txstatus_tasklet
only when both DRIVER_REQUIRE_TXSTATUS_FIFO and
rt2x00dev->ops->lib->txstatus_tasklet are set.

This allows the txstatus_fifo to be used by rt2800usb which
does not use txstatus_tasklet.
Signed-off-by: NJohannes Stezenbach <js@sig21.net>
Signed-off-by: NIvo van Doorn <IvDoorn@gmail.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2x00dev.c

@@ -813,8 +813,7 @@ static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 	/*
 	 * Allocate tx status FIFO for driver use.
 	 */
-	if (test_bit(DRIVER_REQUIRE_TXSTATUS_FIFO, &rt2x00dev->flags) &&
-	    rt2x00dev->ops->lib->txstatus_tasklet) {
+	if (test_bit(DRIVER_REQUIRE_TXSTATUS_FIFO, &rt2x00dev->flags)) {
 		/*
 		 * Allocate txstatus fifo and tasklet, we use a size of 512
 		 * for the kfifo which is big enough to store 512/4=128 tx
@@ -828,6 +827,7 @@ static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 			return status;
 
 		/* tasklet for processing the tx status reports. */
+		if (rt2x00dev->ops->lib->txstatus_tasklet)
 			tasklet_init(&rt2x00dev->txstatus_tasklet,
 				     rt2x00dev->ops->lib->txstatus_tasklet,
 				     (unsigned long)rt2x00dev);