Be compatible to the updated botan's behaviour related to reworked bo…

…tan_cipher_update() function.

src/lib/crypto/symmetric.cpp

@@ -293,7 +293,7 @@ pgp_cipher_aead_update(pgp_crypt_t *crypt, uint8_t *out, const uint8_t *in, size
     }
 
     if ((outwr != len) || (inread != len)) {
-        RNP_LOG("wrong aead usage");
+        RNP_LOG("wrong aead usage: %zu vs %zu, %zu vs %zu", outwr, len, inread, len);
         return false;
     }