radiotap parser: fix endian annotation

When I updated this from the corresponding
userspace library, an annotation error crept
in -- this variable needs to be annotated as
little endian. No effect on code generation.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

include/net/cfg80211.h

@@ -1643,7 +1643,7 @@ struct ieee80211_radiotap_iterator {
 	const struct ieee80211_radiotap_namespace *current_namespace;
 
 	unsigned char *_arg, *_next_ns_data;
-	uint32_t *_next_bitmap;
+	__le32 *_next_bitmap;
 
 	unsigned char *this_arg;
 	int this_arg_index;