Error build on 32 bits arch

[rfccg]

As I try to build my code using a 32 bits architecture with goavro as a dependency I get the following error:

vendor/github.com/linkedin/goavro/array.go:48:34: constant -9223372036854775808 overflows int
vendor/github.com/linkedin/goavro/array.go:86:35: constant -9223372036854775808 overflows int
vendor/github.com/linkedin/goavro/binaryReader.go:96:27: constant -9223372036854775808 overflows int
vendor/github.com/linkedin/goavro/binaryReader.go:144:28: constant -9223372036854775808 overflows int
vendor/github.com/linkedin/goavro/map.go:50:34: constant -9223372036854775808 overflows int
vendor/github.com/linkedin/goavro/map.go:97:35: constant -9223372036854775808 overflows int

To build I used the following command:

GOOS=linux GOARCH=386 go build -a --ldflags="-s" -o bin/injector cmd/injector.go

As I looked at the code all lines that were producing errors are fmt.Errorf that prints the math.MinInt64.
To fix the problem is easy. In the array.go file just replace:

if blockCount == math.MinInt64 {
    // The minimum number for any signed numerical type can never be made positive
    return nil, nil, fmt.Errorf("cannot decode binary array with block count: %d", math.MinInt64)
}

with:

if blockCount == math.MinInt64 {
    // The minimum number for any signed numerical type can never be made positive
    return nil, nil, fmt.Errorf("cannot decode binary array with block count: %d", blockCount)
}

What happens is that for any reason math.MinInt64 is a constant and not a int64.

[karrick]

I'm closing this issue because I have merged in your PR. Thanks again for your help getting 32-bit architecture supported!