Fix for litteral warnings in color_palette.c to address #95 - continued.
Fix for litteral warnings in color_palette.c to address #95 - continued.

ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz