[Bug 667719] waveformsink: Fix mingw warnings

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=667719
  GStreamer | gst-plugins-good | git

--- Comment #1 from Raimo Järvi <raimo.jarvi at gmail.com> 2012-01-11 22:23:32 UTC ---
Created an attachment (id=205048)
 View: https://bugzilla.gnome.org/attachment.cgi?id=205048
 Review: https://bugzilla.gnome.org/review?bug=667719&attachment=205048

Fix warnings

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