kernel32: fix memory leak (found by Smatch).

[Lionel_Debroux]

"WaitNamedPipeW" in dlls/kernel32/sync.c gets flagged by Michael
Stefaniuc's unfree-wine.pl script for leaking "pipe_wait".

pipe_wait isn't used anywhere between its allocation and the memory leak
in the error path. nt_name.Length, which is used for computing
sz_pipe_wait isn't modified either in those lines.
Therefore, I fixed the leak in the error path by moving the allocation
later in the program.

2007-10-06  Lionel Debroux <lionel_debroux at yahoo.fr>
        * dlls/kernel32/sync.c:
        kernel32: fix memory leak (found by Smatch).

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