ath5k: remove own (wrong) IEEE80211_MAX_LEN

Use the version already supplied in include/linux/ieee80211.h.

Signed-off-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath5k/base.c b/drivers/net/wireless/ath/ath5k/base.c
index 0378bbc..91241b4 100644
--- a/drivers/net/wireless/ath/ath5k/base.c
+++ b/drivers/net/wireless/ath/ath5k/base.c
@@ -1709,7 +1709,7 @@
 	struct ath5k_buf *bf;
 	int ret;
 
-	common->rx_bufsize = roundup(IEEE80211_MAX_LEN, common->cachelsz);
+	common->rx_bufsize = roundup(IEEE80211_MAX_FRAME_LEN, common->cachelsz);
 
 	ATH5K_DBG(sc, ATH5K_DEBUG_RESET, "cachelsz %u rx_bufsize %u\n",
 		  common->cachelsz, common->rx_bufsize);