[Bug 796280] wasapisink: crash on pipeline tear down on Windows 7

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796280

--- Comment #10 from Christoph Reiter (lazka) <reiter.christoph at gmail.com> ---
Created attachment 372349
  --> https://bugzilla.gnome.org/attachment.cgi?id=372349&action=edit
wasapi: use FAILED to detect errors

S_FALSE is a valid return value which does not indicate an error.
For example IAudioClient_Stop() returns S_FALSE when it is already stopped.
Use the FAILED macro instead which just checks if an error occured or not.

This fixes spurious warnings when using the wasapisink element.

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