fixes build with -Werror=return-type
twofish.c: In function 'init_twofish':
twofish.c:45:1: error: control reaches end of non-void function [-Werror=return-type]
45 | PyMODINIT_FUNC init_twofish(void) { }
| ^~~~~~
twofish.c: In function 'PyInit__twofish':
twofish.c:46:1: error: control reaches end of non-void function [-Werror=return-type]
46 | PyMODINIT_FUNC PyInit__twofish(void) { }
| ^~~~~~
cc1: some warnings being treated as errors
~~~~~ twofish.c: In function 'PyInit__twofish': twofish.c:46:1: error: control reaches end of non-void function [-Werror=return-type] 46 | PyMODINIT_FUNC PyInit__twofish(void) { } | ^~~~~~ cc1: some warnings being treated as errorsSigned-off-by: Martin Jansa Martin.Jansa@gmail.com