_renderPM.c: fix bus error reported by Craig Jacobs cmjacobs@indiana.edu
_renderPM.c: fix bus error reported by Craig Jacobs cmjacobs@indiana.edu

makinacorpus/reportlab-ecomobile,makinacorpus/reportlab-ecomobile,makinacorpus/reportlab-ecomobile,makinacorpus/reportlab-ecomobile,makinacorpus/reportlab-ecomobile