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compositor: fix off-by-1 error in blending ARGB

Mathieu Duponchelle requested to merge meh/gst-plugins-base:off-by-1-shruw into master

Fixes #810 (closed)

I observed that the off-by-1 error occurred when the subw op was underflowing.

Keep track of whether underflow occurred, and correct the off-by-1 error if so.

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