#294 Fail to decode some files encoded from remove.bg

[Michael Hwang]

Hi all,
The output images decoded from some files encoded by remove.bg are strange.
Top 5 lines are black instead of white for F-22-2.png file and gray area around F16 in F-16-2.png file.
Test results are identical on 1.2.59 / 1.4.22 / 1.5.30 / 1.6.37 and 1.7.0beta89 with ZLib 1.2.11.
Test built is Win32 with Visual C++ 6.0 SP5 or VS2010.
Any help would be appreciated. Thanks.

[Michael Hwang]

Issues were fixed on 1.2.59 / 1.4.22 / 1.5.30 / 1.6.37 but not 1.7.0beta89.
Jumps and exits while reading F-16-2.png file.