We used to compare the init state with == to 0 and 2, which
requires 2 comparisons.  Instead, compare with 1 and use
<, ==.  That requires only one comparison.

This isn't a big deal performance-wise, as it is just init
code.  But there is a fair amount of init code, so this
should help a bit with code size.

Change-Id: I4a2765f1005776f0edce28ac143f4b7596d95a68
Reviewed-on: https://go-review.googlesource.com/18948Reviewed-by: David Chase <drchase@google.com>