The type of the "data" pointer may not be compatible with the type of
the "to_free" / output pointer. This is due to constness, and that we
are unable in C to remove constness from a type.
For example,
{
const char *const *data = ...;
gs_free const char **cpy_to_free = NULL;
const char **cpy;
cpy = nm_memdup_maybe_a (300, data, NM_PTRARRAY_LEN (data) + 1, &cpy_to_free);
}
is prefectly valid , but would not have compiled.
It shows that "data" is not of type "*(&cpy_to_free)", but rather
it might be a non-const pointer of the same type.
Fixes: d0e1d0e626 ('shared: propagate types in nm_malloc_maybe_a(), nm_malloc0_maybe_a(), nm_memdup_maybe_a()')
fbddd27e73