[Bf-blender-cvs] [3cfccf11997] blender-v2.93-release: Fix T95137: Spline calc_length not working with just 1 NURB point

[Jesse Yurkovich]

Commit: 3cfccf11997e9dc2f07000b9d802f0a6038e8ec1
Author: Jesse Yurkovich
Date:   Thu Feb 3 22:39:57 2022 +1100
Branches: blender-v2.93-release
https://developer.blender.org/rB3cfccf11997e9dc2f07000b9d802f0a6038e8ec1

Fix T95137: Spline calc_length not working with just 1 NURB point

The NURB case did not properly handle a curve with only 1 point.

Ref D13904

===================================================================

M	source/blender/blenkernel/intern/curve.c

===================================================================

diff --git a/source/blender/blenkernel/intern/curve.c b/source/blender/blenkernel/intern/curve.c
index 37cd62c3bc8..4fc4f3e0bcd 100644
--- a/source/blender/blenkernel/intern/curve.c
+++ b/source/blender/blenkernel/intern/curve.c
@@ -915,7 +915,7 @@ float BKE_nurb_calc_length(const Nurb *nu, int resolution)
         pntsit = points + 3;
       }
 
-      while (--b) {
+      while (--b > 0) {
         length += len_v3v3(prevpntsit, pntsit);
         prevpntsit = pntsit;
         pntsit += 3;