tree f62a0c9896e87c73a8c63b1bfce06ea9db300c45
parent 105c416007eb6093812af0799fee7dec52199686
author Glenn Randers-Pehrson <glennrp at users.sourceforge.net> 1290370001 -0600
committer Glenn Randers-Pehrson <glennrp at users.sourceforge.net> 1290370001 -0600

[devel] Changes to remove gcc warnings (John Bowler)

Certain optional gcc warning flags resulted in warnings in libpng code.
With these changes only -Wconversion and -Wcast-qual cannot be turned on.
Changes are trivial rearrangements of code.  -Wconversion is not possible
for pngrutil.c (because of the widespread use of += et al on variables
smaller than (int) or (unsigned int)) and -Wcast-qual is not possible
with pngwio.c and pngwutil.c because the 'write' callback and zlib
compression both fail to declare their input buffers with 'const'.