Fix for a crash in the Bezier Curve geometry modifier.
Least-squares fitting parameters were stored in a fixed size array, causing a
buffer overflow depending on the number of input points.
Problem report with a .blend file to reproduce the issue and a bugfix patch by
christiankrupa and jensverwiebe on IRC, thanks a lot!
Many thanks also to Bastien Montagne for forwarding the problem report by email.

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@55942 954f8c5b-7b00-dc11-b283-0030488c597c