small point of detail

[ml]

hello all gurus
I just go a small part of the code and I wonder one thing that is a
small point of detail

  *_entry = gnutls_calloc (1, sizeof (SRP_PWD_ENTRY));
  if (*_entry == NULL)
    {
      gnutls_assert ();
      return GNUTLS_E_MEMORY_ERROR;
    }
  entry = *_entry;

i do not understand this line
*_entry is allocated of the same size ?

please answer me
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