make style

client/src/mifare/desfire_crypto.c

@@ -282,7 +282,7 @@ void cmac_generate_subkeys(desfirekey_t key) {
 void cmac(const desfirekey_t key, uint8_t *ivect, const uint8_t *data, size_t len, uint8_t *cmac) {
     int kbs = key_block_size(key);
     if (kbs == 0) {
-       return;
+        return;
     }
 
     uint8_t *buffer = malloc(padded_data_length(len, kbs));