Cleaned up use of pointers in PNG library#5

Merged

annejan merged 2 commits intoSHA2017-badge:masterfrom aczid:png

Jun 21, 2017

+8-8

Commits on Jun 18, 2017

Working on PNG support
Aram
committed

Commits on Jun 21, 2017

Merge branch 'master' of https://github.com/SHA2017-badge/ugfx into png
Aram
committed