Fix harmless signed integer overflow.
When computing: t1 = (bayer[1] + bayer[bayer_step] + bayer[bayer_step+2] + bayer[bayer_step*2+1])*G2Y; there is a T (unsigned short or char) multiplied by an int which can overflow. Then again, it is stored to t1 which is unsigned so the overflow disappears. Keeping all unsigned is safer.
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