Gustavo A. R. Silva 65d786c21b net: fix potential null pointer dereference
Add null check to avoid a potential null pointer dereference.

Addresses-Coverity-ID: 1408831
Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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