Fix error double accounting in fuzzyCompare()

Fix error double accounting in fuzzyCompare()

fuzzyCompare() has a loop to go through all the pixels and generate error sum.
It skips some pixels using random number generator between 0-8.
Random number generator sometime generate 0 and it ends up
calculating error sum twice for the same pixel.
If this pixel has error, then this add up error sum twice.

Components: Framework

Change-Id: I08e06e29faedb99cfd8fa479e97a437c06008848