[Bug 721320] orcarm: fix for strict XCode compiler

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=721320
  GStreamer | orc | git

--- Comment #1 from Todd Agulnick <todd at agulnick.com> 2014-01-02 01:26:21 UTC ---
Created an attachment (id=265117)
 View: https://bugzilla.gnome.org/attachment.cgi?id=265117
 Review: https://bugzilla.gnome.org/review?bug=721320&attachment=265117

Cast before compare to silence Xcode compiler.

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