[Bug 739281] New: video-blend: correct improper logic calculations

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=739281
  GStreamer | gst-plugins-base | unspecified

           Summary: video-blend: correct improper logic calculations
    Classification: Platform
           Product: GStreamer
           Version: unspecified
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: vineeth.tm at samsung.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


in gst_video_blend function

when x/y are less than zero, then they are set to 0,
but the src_width and height are recalculated based on the same
this results in wrong values of src_width and height.
And in basetextoverlay, we are already setting x and y to 0,
when they are less than 0.
Hence removing the improper logic.

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