mac80211: remove WLAN_FC_DATA_PRESENT

All users are gone now.
Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/mac80211/ieee80211_i.h

@@ -36,8 +36,6 @@
 #define ETH_P_PAE 0x888E /* Port Access Entity (IEEE 802.1X) */
 #endif /* ETH_P_PAE */
 
-#define WLAN_FC_DATA_PRESENT(fc) (((fc) & 0x4c) == 0x08)
-
 struct ieee80211_local;
 
 /* Maximum number of broadcast/multicast frames to buffer when some of the