Cast sz to uint32 to fix compilation on 32 bit (#1175)
Cast sz to uint32 to fix compilation on 32 bit (#1175)

`env GOOS=linux GOARCH=arm GOARM=7 go build` no longer fails with overflow.

Similar to commit fb0cdb858c78004b9db8f08e91bb713780b20445.

Signed-off-by: Christian Stewart <2314b2e3a4a1f7db165be2aafbf1efd78f28cc97@paral.in>
dgraph-io/badger,dgraph-io/badger