[PATCH,fortran]: fix for PR 33040

[François-Xavier Coudert]

> 2007-09-10  Christopher D. Rickett  <crickett@lanl.gov>
>
>         PR fortran/33040
>         * trans-expr.c (gfc_trans_structure_assign): Convert component
>         C_NULL_PTR and C_NULL_FUNPTR component initializers to (void *).
>         * trans-types.c (gfc_get_derived_type): Create a backend_decl for
>         the c_address field of C_PTR and C_FUNPTR and ensure initializer
>         is of proper type/kind for (void *).

OK, thanks!