[PLIP] Check cmd in plip_ioctl

[Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>]

Hi Jeff:

I received a bug report that a PLIP interface was incorrectly identified
as wireless because plip_ioctl did not check what the value of cmd is
before processing the request.

This patch fixes exactly that.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email:  Herbert Xu ~{PmV>HI~} <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

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