[Bug 660304] videotestsrc: Fix mingw compiler warning

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=660304
  GStreamer | gst-plugins-base | git

--- Comment #1 from Raimo Järvi <raimo.jarvi at gmail.com> 2011-09-27 22:59:58 UTC ---
Created an attachment (id=197615)
 View: https://bugzilla.gnome.org/attachment.cgi?id=197615
 Review: https://bugzilla.gnome.org/review?bug=660304&attachment=197615

Fix warning

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