Re: [PATCH 4/5] net: sfc: fix return value check inefx_ptp_probe_channel().

[David Miller]

From: Cyril Roelandt <tipecaml@xxxxxxxxx>
Date: Wed, 12 Dec 2012 01:24:53 +0100

> The ptp_clock_register() returns ERR_PTR() and never returns NULL. Replace the
> NULL check by a call to IS_ERR().
> 
> Signed-off-by: Cyril Roelandt <tipecaml@xxxxxxxxx>

I'll let Ben queue this up.

Probably he'll want to avoid potentially leaving an ERR_PTR
in ptp->phc_clock even if, with this fix, that would be
harmless.
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