[Gtkradiant] [Bug 684] New: Cleanup pnp NULL Typecasts in plugins/imagepng/plugin.cpp

[gtkradiant@zerowing.idsoftware.com]

http://zerowing.idsoftware.com/bugzilla/show_bug.cgi?id=684

           Summary: Cleanup pnp NULL Typecasts in
                    plugins/imagepng/plugin.cpp
           Product: GtkRadiant
           Version: 1.2
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: editor
        AssignedTo: ttimo@idsoftware.com
        ReportedBy: michael@johalla.de


We use two diffent Typecasts for NULL:
(png_infopp)NULL and png_infopp_NULL

After looking into <png.h> I think png_infopp_NULL should be preferred. Patch
follows.