ath9k: use WARN_ON_ONCE in ath_rc_get_highest_rix

The device seems to survive the issue, so no need to flood the logs
about it...

Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
John W. Linville 2012-01-30 10:53:55 -05:00
commit 41b2d62702