[bindings/go] fix vet errors

Fix "go vet" errors, which will be
run automatically with "go test" as
of Go 1.10.

Patch by Karsten Weiss!



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@321509 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed