Vincent Sanders f2e8be9fe7 Cleanup png code
only use the bitmap pointer in the png content the one in teh base content seems extraneous for png.

svn path=/trunk/netsurf/; revision=12304
2011-05-07 23:35:57 +00:00
..
2010-07-09 21:11:06 +00:00
2011-05-07 23:35:57 +00:00