Bugfix the key mockup (revealed by clang).

src/keys.h

@@ -65,7 +65,7 @@ static struct key {
 static inline uint8_t *
 get_key(uint8_t *id, uint8_t idlen)
 {
-	for (int i = 0; key[i].key != NULL; i++)
+	for (int i = 0; key[i].id != NULL; i++)
 		if (idlen != key[i].idlen)
 			continue;
 		else if (idlen == 0 && key[i].idlen == 0)