Significance of collision check loop flag

Does anyone know the significance of removing the "while" from this loop would be:

bool Vehicle::resolveCollision(Rigid&  ns,CollisionList& cList)
{
   // Apply impulses to resolve collision
   bool colliding, collided = false;

   do {
      colliding = false;
      for (S32 i = 0; i < cList.count; i++) {
         Collision& c = cList.collision[i];
         if (c.distance < mDataBlock->collisionTol) {
            // Velocity into surface
            Point3F v,r;
            ns.getOriginVector(c.point,&r);
            ns.getVelocity(r,&v);
            F32 vn = mDot(v,c.normal);

            // Only interested in velocities greater than sContactTol,
            // velocities less than that will be dealt with as contacts
            // "constraints".
            if (vn < -mDataBlock->contactTol) {

               // Apply impulses to the rigid body to keep it from
               // penetrating the surface.
               ns.resolveCollision(cList.collision[i].point,
                  cList.collision[i].normal);
               colliding = collided  = true;

               // Keep track of objects we collide with
               if (!isGhost() && c.object->getTypeMask() & ShapeBaseObjectType) {
                  ShapeBase* col = static_cast<ShapeBase*>(c.object);
                  queueCollision(col,v - col->getVelocity());
               }
            }
         }
      }
   } while (colliding && 0); // Test without repeat, this is what I changed

   return collided;
}

The reason I changed the while check is because this was causing my the engine to lock up when the collisionTol was low for my vehicle. If I get rid of this loop continuing on then my vehicle seems to still collide just fine, but it does not lock up.

Thanks,
Frank