cffi-tests: fix pointer-to-integer casts in libtest.c
cffi-tests: fix pointer-to-integer casts in libtest.c

dochang/cffi,attila-lendvai/cffi,stassats/cffi,3b/cffi,wesen/cffi,akovalenko/cffi,dochang/cffi,marsijanin/cffi,stassats/cffi,stassats/cffi,mcna/cffi,dkochmanski/cffi,dochang/cffi,cffi/cffi,attila-lendvai/cffi,wesen/cffi,3b/cffi,dkochmanski/cffi,marsijanin/cffi,3b/cffi,cffi/cffi,kingcheez/cffi-cheez,marsijanin/cffi,wesen/cffi,mcna/cffi,cffi/cffi,akovalenko/cffi,akovalenko/cffi,kingcheez/cffi-cheez,kingcheez/cffi-cheez,dkochmanski/cffi