[PATCH][GSoc] Changed signed flags to unsigned type

As part of my microproject : Use unsigned integral type for collection of bits: Pick one field of a structure that (1) is of signed integral type and (2) is used as a collection of multiple bits. Discuss if there is a good reason why it has to be a signed integral field and change it to an

Reg : GSoC 2017 Microproject

Hi, I would like to participate in GSoC 2017 and I have chosen the Use unsigned integral type for collection of bits , idea from the Micro projects list. I request the help of the community for clarifying a few questions that I have. 1. Is this Microproject already taken ? 2. If it is free , I