[PATCH] P2P: Add error message for invalid PIN

[Masashi Honma]

Hello.

The second argument of p2p_connect command is "pin", "pbc" or PIN number.

But PIN number is not checked. So the user typed "pbd" can not
recognize he mistyped.
Because the command returns "OK".

So I made a patch adds a error message.

Regards,
Masashi Honma
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