fix multiple definitions of is_*_addr functions by moving them to static

include/ieee80211.h

@@ -1584,18 +1584,18 @@ enum ieee80211_state {
 	(((Addr[2]) & 0xff) == 0xff) && (((Addr[3]) & 0xff) == 0xff) && (((Addr[4]) & 0xff) == 0xff) && \
 				     (((Addr[5]) & 0xff) == 0xff))
 #else
-extern __inline int is_multicast_mac_addr(const u8 *addr)
+static __inline int is_multicast_mac_addr(const u8 *addr)
 {
 	return (addr[0] != 0xff) && (0x01 & addr[0]);
 }
 
-extern __inline int is_broadcast_mac_addr(const u8 *addr)
+static __inline int is_broadcast_mac_addr(const u8 *addr)
 {
 	return ((addr[0] == 0xff) && (addr[1] == 0xff) && (addr[2] == 0xff) &&   \
 		(addr[3] == 0xff) && (addr[4] == 0xff) && (addr[5] == 0xff));
 }
 
-extern __inline int is_zero_mac_addr(const u8 *addr)
+static __inline int is_zero_mac_addr(const u8 *addr)
 {
 	return ((addr[0] == 0x00) && (addr[1] == 0x00) && (addr[2] == 0x00) &&   \
 		(addr[3] == 0x00) && (addr[4] == 0x00) && (addr[5] == 0x00));