rt2x00: allow txstatus_fifo w/o txstatus_tasklet
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: Johannes Stezenbach <93f8bb0eb2c659b85694486c41717eaf0fe23cd4@sig21.net>
Signed-off-by: Ivo van Doorn <eb95d5f7a69eb0f8d26a960fe33483acdf581277@gmail.com>
Signed-off-by: John W. Linville <2a53bac7a5d324865ef46ec4c38b2c0fba1456b4@tuxdriver.com>

KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs