[Bug 673436] New: mpegvideoparser: fix check for too small buffer

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=673436
  GStreamer | gst-plugins-bad | git

           Summary: mpegvideoparser: fix check for too small buffer
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: prahal at yahoo.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=211225)
 View: https://bugzilla.gnome.org/attachment.cgi?id=211225
 Review: https://bugzilla.gnome.org/review?bug=673436&attachment=211225

mpegvideoparser: fix check for too small buffer

The check is against size which is removed the offset.
It fails if the result is 0 or negative. Though as size is
unsigned instead of becoming negative it wraps.

Use an intermediate signed variable to fix the check.

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