==28178== Use of uninitialised value of size 4
==28178==    at 0x8048B98: PNG_add_headers (in /home/florian/png-reader/dist/png-reader)
==28178==    by 0x8048B1F: PNG_build_frames (in /home/florian/png-reader/dist/png-reader)
==28178==    by 0x8048868: main (in /home/florian/png-reader/dist/png-reader)
==28178==  Uninitialised value was created by a heap allocation
==28178==    at 0x4023F50: malloc (vg_replace_malloc.c:236)
==28178==    by 0x8048B43: PNG_add_headers (in /home/florian/png-reader/dist/png-reader)
==28178==    by 0x8048B1F: PNG_build_frames (in /home/florian/png-reader/dist/png-reader)
==28178==    by 0x8048868: main (in /home/florian/png-reader/dist/png-reader)