bitcoin-tx: Fix JSON validation of prevtxs

[ers35]

No description provided.

[ers35]

I had not actually tested bitcoin-tx with 2a3d988. With a089c50 I can sign a tx like so (already compromised private key):

bitcoin-tx -create -json \
'set=privatekeys:["5HpHagT65TZzG1PH3CSu63k8DbpvD8s5ip4nEB3kEsreAnchuDf"]' \
'set=prevtxs:[{"txid":"4d49a71ec9da436f71ec4ee231d04f292a29cd316f598bb7068feccabdc59485","vout":0,"scriptPubKey":"4d49a71ec9da436f71ec4ee231d04f292a29cd316f598bb7068feccabdc59485"}]' \
'sign=' \
'outaddr=0.00000001:193P6LtvS4nCnkDvM9uXn1gsSRqh4aDAz7'

{
    "txid": "184c7a9d2115ccc2f2ab9f112b6cc430d6fa9ba2dd05e96e21bd063ca1b05c61",
    "version": 1,
    "locktime": 0,
    "vin": [
    ],
    "vout": [
        {
            "value": 0.00000001,
            "n": 0,
            "scriptPubKey": {
                "asm": "OP_DUP OP_HASH160 5834479edbbe0539b31ffd3a8f8ebadc2165ed01 OP_EQUALVERIFY OP_CHECKSIG",
                "hex": "76a9145834479edbbe0539b31ffd3a8f8ebadc2165ed0188ac",
                "reqSigs": 1,
                "type": "pubkeyhash",
                "addresses": [
                    "193P6LtvS4nCnkDvM9uXn1gsSRqh4aDAz7"
                ]
            }
        }
    ],
    "hex": "01000000000101000000000000001976a9145834479edbbe0539b31ffd3a8f8ebadc2165ed0188ac00000000"
}

[jonasschnelli]

ACK

[jgarzik]

ACK

[jgarzik]

tested re-ACK