Until da6f8ba in upstream git repository, sctp_init_ifns_for_vrf() was
using the MALLOC and FREE macros, using respectively HeapAlloc and
HeapFree. da6f8ba changed the allocations to use GlobalAlloc, but didn't
change the deallocations to use the symmetric GlobalFree.
This doesn't seem to cause direct problems, but when wrapping one family
of allocation functions, the dissymmetry causes allocator mismatch
problems.
Moreover, the MALLOC macro being unused, it might as well be removed,
along the FREE macro, so that both allocations and deallocations use one
API explicitly.
See https://github.com/sctplab/usrsctp/pull/92
d5a26f74b7