Incomplete multiple const formatting inconsistency

This: 

``` go
package main

const (
    B = 10 // asdf
    A // adsf
    C1 // adf
)
```

should be formatted like this:

``` go
package main

const (
    B  = 10 // asdf
    A       // adsf
    C1      // adf
)
```

but is formatted like:

``` go
package main

const (
    B = 10 // asdf
    A       // adsf
    C1      // adf
)
```

notice the space between `B` and `=`
