Upgrade libtomcrypt

Sources/DataLiteC/libtomcrypt/encauth/gcm/gcm_add_aad.c

@@ -20,7 +20,6 @@ int gcm_add_aad(gcm_state *gcm,
                const unsigned char *adata,  unsigned long adatalen)
 {
    unsigned long x;
-   int           err;
 #ifdef LTC_FAST
    unsigned long y;
 #endif
@@ -34,10 +33,6 @@ int gcm_add_aad(gcm_state *gcm,
       return CRYPT_INVALID_ARG;
    }
 
-   if ((err = cipher_is_valid(gcm->cipher)) != CRYPT_OK) {
-      return err;
-   }
-
    /* in IV mode? */
    if (gcm->mode == LTC_GCM_MODE_IV) {
       /* IV length must be > 0 */