collector: fix golint problems in ZFS collector (#1132)
collector: fix golint problems in ZFS collector (#1132)

Signed-off-by: Matt Layher <76528ff2e917253aa2211f68e4ca60b5b846dcf5@gmail.com>
derekmarcotte/node_exporter,siavashs/node_exporter,derekmarcotte/node_exporter,siavashs/node_exporter,siavashs/node_exporter,prometheus/node_exporter,prometheus/node_exporter,derekmarcotte/node_exporter,derekmarcotte/node_exporter,prometheus/node_exporter,siavashs/node_exporter