iwinfo: add missing HT modename for HT-None

Commit bf2c1069a7 ("nl80211: add htmode to iwinfo_ops") increased
IWINFO_HTMODE_COUNT but left the size of the IWINFO_HTMODE_NAMES array
untouched, leading to a segmentation fault when trying to get the HT
modelist from Lua.

Add a dummy NOHT modestring to make the array size fit the size
declaration.

Fixes: bf2c1069a7 ("nl80211: add htmode to iwinfo_ops")

Signed-off-by: David Bauer <mail@david-bauer.net>

iwinfo_lib.c

@@ -65,6 +65,7 @@ const char *IWINFO_HTMODE_NAMES[] = {
 	"VHT80",
 	"VHT80+80",
 	"VHT160",
+	"NOHT"
 };