libs/iwinfo: forgot to clear string buffer in wrapper function

libs/iwinfo/src/include/broadcom.h

@@ -14,8 +14,8 @@
  *
  */
 
-#ifndef _wlioctl_h_
-#define	_wlioctl_h_
+#ifndef _BROADCOM_H
+#define _BROADCOM_H
 
 #define WL_MCSSET_LEN				16
 #define WL_MAX_STA_COUNT			32
@@ -73,4 +73,4 @@ typedef struct wl_ioctl {
 	uint32_t				needed;	/* bytes needed (optional) */
 } wl_ioctl_t;
 
-#endif /* _wlioctl_h_ */
+#endif

libs/iwinfo/src/include/madwifi.h

@@ -18,6 +18,8 @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#ifndef _MADWIFI_H
+#define _MADWIFI_H
 
 /* ieee80211.h */
 #define	IEEE80211_ADDR_LEN		6
@@ -118,3 +120,4 @@ struct ieee80211req_sta_info {
 	u_int8_t isi_opmode;		/* sta operating mode */
 };
 
+#endif

libs/iwinfo/src/iwinfo_lualib.h

@@ -51,6 +51,7 @@
 	{													\
 		const char *ifname = luaL_checkstring(L, 1);	\
 		char rv[IWINFO_BUFSIZE];						\
+		memset(rv, 0, IWINFO_BUFSIZE);					\
 		if( !type##_get_##op(ifname, rv) )				\
 			lua_pushstring(L, rv);						\
 		else											\