Fixed crash rendering small circles.
Fixed crash rendering small circles.

svn path=/trunk/libavg/; revision=3763

th3infinity/libavg,libavg/libavg,scotty007/libavg,libavg/libavg,hoodie/libavg,th3infinity/libavg,th3infinity/libavg,yyd01245/libavg,scotty007/libavg,libavg/libavg,libavg/libavg,hoodie/libavg,yyd01245/libavg,scotty007/libavg,hoodie/libavg,th3infinity/libavg,scotty007/libavg,yyd01245/libavg,hoodie/libavg,yyd01245/libavg