kernel32: initialize hole in struct in WaitNamedPipeW to avoid Valgrind warnings

[Dan Kegel]

This initializes a one byte hole in a struct sent to the server.
Without this fix, running any app produces Valgrind warnings like:

 Syscall param writev(vector[...]) points to uninitialised byte(s)
    at  (within /lib/ld-2.5.so)
    by  wine_server_call (server.c:244)
    by  server_ioctl_file (file.c:1027)
    by  NtFsControlFile (file.c:1241)
    by  WaitNamedPipeW (sync.c:1326)
    by  service_open_pipe (service.c:341)
    by  QueryServiceStatusEx (service.c:1768)
    by  QueryServiceStatus (service.c:1704)
    by  StartServiceW (service.c:1623)
    by  main (wineboot.c:569)
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