net: dsa: loop: Check for memory allocation failure
If 'devm_kzalloc' fails, a NULL pointer will be dereferenced. Return -ENOMEM instead, as done for some other memory allocation just a few lines above. Fixes: 98cd1552 ("net: dsa: Mock-up driver") Signed-off-by: NChristophe JAILLET <christophe.jaillet@wanadoo.fr> Reviewed-by: NAndrew Lunn <andrew@lunn.ch> Acked-by: NFlorian Fainelli <f.fainelli@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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