[Bug 733046] visual: Fix usage with < 0.4

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=733046
  GStreamer | gst-plugins-base | unspecified

--- Comment #1 from Edward Hervey <bilboed at bilboed.com> 2014-07-11 07:34:38 UTC ---
Created an attachment (id=280473)
 View: https://bugzilla.gnome.org/attachment.cgi?id=280473
 Review: https://bugzilla.gnome.org/review?bug=733046&attachment=280473

visual: Fix usage with < 0.4

This got broken in the baseaudiovisualizer refactoring in
5e6abc449b16ee3b944251728c477347ea34351f

While libvisual 0.2 is 8 years old ... we should still try not to
break it.

Just revert changes, and also apply a cast (to silence clang sign
warnings).

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