Fix reference counting bug in graphics state material.
Fix reference counting bug in graphics state material.

darcs-hash:20080308121639-86a4e-0251207f7708cc1edac85b20af3967b0d74518e2.gz

nqv/mupdf,nqv/mupdf,nqv/mupdf,nqv/mupdf,nqv/mupdf,nqv/mupdf