zd1211rw: include mac80211.h from zd_chip.h

zd_chip.h contains one function with a pointer to ieee80211_hw but doesn't
include mac80211.h. As a temporary solution include mac80211.h to avoid
a warning.
Signed-off-by: Kalle Valo <kvalo@adurom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/zd1211rw/zd_chip.h

@@ -21,6 +21,8 @@
 #ifndef _ZD_CHIP_H
 #define _ZD_CHIP_H
 
+#include <net/mac80211.h>
+
 #include "zd_rf.h"
 #include "zd_usb.h"