- fix Ray vars unlocking

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@7149 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

engine/src/core/com/jme3/math/Ray.java

@@ -231,6 +231,7 @@ public final class Ray implements Savable, Cloneable, Collidable {
             dirDotNorm = -dirDotNorm;
         } else {
             // ray and triangle/quad are parallel
+            assert vars.unlock();
             return false;
         }