Dereferenced pointer checks in data.c of ECPG

Hi all,

ecpg_get_data@data.c is using to null-pointer checks for pval but it happens that we have the guarantee that those pointers are never NULL, see for example this piece of code at the code of ecpg_get_data():
        /* pval is a pointer to the value */
        if (!pval)
        {
                /*
                 * This should never happen because we already checked that we found
                 * at least one tuple, but let's play it safe.
                 */
                ecpg_raise(lineno, ECPG_NOT_FOUND, ECPG_SQLSTATE_NO_DATA, NULL);
                return (false);
        }