w32: Fix bad-function-cast warning.
* src/w32-fd-t.inc.h (assuan_fd_from_posix_fd): Avoid compiler warning.
The actual warning was:
warning: cast from function call of type 'intptr_t' {aka 'int'} to
non-matching type 'void *' [-Wbad-function-cast] return (assuan_fd_t)(HANDLE) _get_osfhandle (fd);
- Signed-off-by: Werner Koch <wk@gnupg.org>