src/nci/libffi.c: Throws warnings under various make targets

[jkeenan]

As reported in  TT 1922, src/nci/libffi.c throws warnings in each of 3 different make targets: apilist, exportlist and malloclist. These targets are all ultimately wrappers around the headerizer. The warnings are the same in each target:

src/nci/libffi.c
    build_ffi_thunk: Returns a pointer, 
      but no PARROT_CAN(NOT)_RETURN_NULL macro found.
    clone_ffi_thunk: Returns a pointer, 
      but no PARROT_CAN(NOT)_RETURN_NULL macro found.
    init_thunk_pmc: Returns a pointer, 
      but no PARROT_CAN(NOT)_RETURN_NULL macro found.
    nci_to_ffi_type: Returns asrc/nci/libffi.c pointer, 
      but no PARROT_CAN(NOT)_RETURN_NULL macro found.
4 warnings in 4 funcs in 1 C files

These should be addressed.

[nwellnhof]

Should be fixed by 193b47f

[jkeenan]

nwellnhof++ Thanks, that seems to have done the trick.

Closing ticket.

kid51