rt2x00: Add helper function for reporting tx status
At some points, some drivers can't report the full TX status information. This can happen for the UNKNOWN state, or the FAILURE state (in case the URB failed). Add a wrapper function to simplify reporting the empty TX information. Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com> Acked-by: Helmut Schaa <helmut.schaa@googlemail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
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