ath9k: fix AR_TXCFG_DMASZ_MASK value

The current bitmask is invalid, because the tx dma size is a 3 bit wide
value.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
1 file changed