server: Fix leak of async handle in pipe_server_flush.

[Sebastian Lackner]

Fixes the wineserver handle leak introduced by:

--- snip ---
commit 67da7ba597783c18bd6c349d89809e00299e2d20
Author: Alexandre Julliard <julliard at winehq.org>
Date:   Fri May 8 18:01:08 2015 +0900

    server: Use the async queue for pipe flush requests.
--- snip ---

Can be reproduced by running the kernel32/pipe tests.

---
 server/named_pipe.c | 1 +
 1 file changed, 1 insertion(+)
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