Match against math.MaxInt32 in the Go code.
Match against math.MaxInt32 in the Go code.

When building for 32-bit, len() in Go returns a (signed) 32-bit value.
This was exceeding the constant (2^32) and causing a build failure.

Change-Id: I3b0c08792b0fea0be8d571ebd7ebc1714f9a86a2

fuchsia-mirror/third_party-roughtime,fuchsia-mirror/third_party-roughtime,fuchsia-mirror/third_party-roughtime,fuchsia-mirror/third_party-roughtime