[ODE] dBodyGetGravityMode() patch

[David McClurg]

in ode.cpp, i think dBodyGetGravityMode() has the test inverted.  since mode==1 means that the dxBodyNoGravity flag is cleared, the test should be "((b->flags & dxBodyNoGravity) == 0)".  here's the current code...


void dBodySetGravityMode (dBodyID b, int mode)
{
  dAASSERT (b);
  if (mode) b->flags &= ~dxBodyNoGravity;
  else b->flags |= dxBodyNoGravity;
}


int dBodyGetGravityMode (dBodyID b)
{
  dAASSERT (b);
  return ((b->flags & dxBodyNoGravity) != 0);
}