Fixing bug in faceIntersection where the sign of the distance was

being discarded on return from the triPointRef intersecion test.  Was
only appearing when using FULL_RAY tests.

src/OpenFOAM/meshes/meshShapes/face/faceIntersection.C

@@ -159,9 +159,9 @@ Foam::pointHit Foam::face::intersection
 
         if (curHit.hit())
         {
-            if (Foam::mag(curHit.distance()) < nearestHitDist)
+            if (Foam::mag(curHit.distance()) < Foam::mag(nearestHitDist))
             {
-                nearestHitDist = Foam::mag(curHit.distance());
+                nearestHitDist = curHit.distance();
                 nearest.setHit();
                 nearest.setPoint(curHit.hitPoint());
             }