Code: image_transform_ini_end(PNG_CONST image_transform *this,
    transform_display *that)
 {
    UNUSED(this)
   UNUSED(that)

 }

Commit Message: DO NOT MERGE Update libpng to 1.6.20

BUG:23265085
Change-Id: I85199805636d771f3597b691b63bc0bf46084833
(cherry picked from commit bbe98b40cda082024b669fa508931042eed18f82)

CWE ID: 
image_transform_ini_end(PNG_CONST image_transform *this,
image_transform_ini_end(const image_transform *this,
    transform_display *that)
 {
    UNUSED(this)
   UNUSED(that)

 }
