remove useless check, this is a fixed-size array, thus pointer is never NULL

src/mint-lib/mint_api_refresh.c

@@ -333,14 +333,11 @@ free_melt_data (struct MeltData *md)
   }
 
   for (i=0;i<TALER_CNC_KAPPA;i++)
-  {
-    if (NULL != md->fresh_coins)
   {
     for (j=0;j<md->num_fresh_coins;j++)
       free_fresh_coin (&md->fresh_coins[i][j]);
     GNUNET_free (md->fresh_coins[i]);
   }
-  }
   /* Finally, clean up a bit...
      (NOTE: compilers might optimize this away, so this is
      not providing any strong assurances that the key material