ath5k: fix rx descriptor debugging

In the debug ouptut rx_status_0 was printed twice instead of rx_status_1. Also
make the debug message more clear.

Signed-off-by: Bruno Randolf <br1@einfach.org>
Acked-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>