wireless: avoid some net/ieee80211.h vs. linux/ieee80211.h conflicts

There is quite a lot of overlap in definitions between these headers...

Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/include/net/lib80211.h b/include/net/lib80211.h
index 906d96f..e1558a1 100644
--- a/include/net/lib80211.h
+++ b/include/net/lib80211.h
@@ -8,9 +8,11 @@
 #ifndef LIB80211_H
 #define LIB80211_H
 
+#include <linux/ieee80211.h>
+
 /* print_ssid() is intended to be used in debug (and possibly error)
  * messages. It should never be used for passing ssid to user space. */
 const char *print_ssid(char *buf, const char *ssid, u8 ssid_len);
-#define DECLARE_SSID_BUF(var) char var[32 * 4 + 1] __maybe_unused
+#define DECLARE_SSID_BUF(var) char var[IEEE80211_MAX_SSID_LEN * 4 + 1] __maybe_unused
 
 #endif /* LIB80211_H */