Correct btcctl getblockhash.

Also run gofmt while here.

util/btcctl/btcctl.go

@@ -51,10 +51,9 @@ var commandHandlers = map[string]*handlerData{
 	"addnode":              &handlerData{2, 0, displaySpewDump, nil, makeAddNode, "<ip> <add/remove/onetry>"},
 	"decoderawtransaction": &handlerData{1, 0, displaySpewDump, nil, makeDecodeRawTransaction, "<txhash>"},
 	"getbestblockhash":     &handlerData{0, 0, displayGeneric, nil, makeGetBestBlockHash, ""},
-	"getblock": &handlerData{1, 0, displaySpewDump, nil, makeGetBlock,
-		"<blockhash>"},
+	"getblock":             &handlerData{1, 0, displaySpewDump, nil, makeGetBlock, "<blockhash>"},
 	"getblockcount":        &handlerData{0, 0, displayFloat64, nil, makeGetBlockCount, ""},
-	"getblockhash":       &handlerData{1, 0, displayGeneric, []conversionHandler{toInt}, makeGetBlockHash, "<blocknumber>"},
+	"getblockhash":         &handlerData{1, 0, displayGeneric, []conversionHandler{toInt64}, makeGetBlockHash, "<blocknumber>"},
 	"getconnectioncount":   &handlerData{0, 0, displayFloat64, nil, makeGetConnectionCount, ""},
 	"getdifficulty":        &handlerData{0, 0, displayFloat64, nil, makeGetDifficulty, ""},
 	"getgenerate":          &handlerData{0, 0, displayGeneric, nil, makeGetGenerate, ""},
@@ -77,6 +76,19 @@ func toInt(val string) (interface{}, error) {
 	return idx, nil
 }
 
+// toInt64 attempts to convert the passed string to an int64.  It returns the
+// integer packed into an interface so it can be used in the calls which expect
+// interfaces.  An error will be returned if the string can't be converted to an
+// integer.
+func toInt64(val string) (interface{}, error) {
+	idx, err := strconv.ParseInt(val, 10, 64)
+	if err != nil {
+		return nil, err
+	}
+
+	return idx, nil
+}
+
 // displayGeneric is a displayHandler that simply displays the passed interface
 // using fmt.Println.
 func displayGeneric(reply interface{}) error {