[ewg] [PATCH] mlx4: Fix bug in mlx4_ib_mcg_attach

[Roland Dreier]

 > > This bug doesn't seem to ever have been present in the upstream
 > > kernel -- what are you generating this patch against?

 > I think it came from your for-next branch.

I don't see anything touching this code there.  The patch that
introduced this code upstream, 521e575b ("IB/mlx4: Add support for
blocking multicast loopback packets") doesn't have this bug and I don't
see anything else that changed that area of the code.

 - R.