Use Go 1.13 error features

* Use `errors.Is()` for unwrapping errors.
* Use `%w` error verb in internal error formatting.

Signed-off-by: Ben Kochie <superq@gmail.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/collector/netclass_linux.go b/collector/netclass_linux.go
index cbfcb62..0fde219 100644
--- a/collector/netclass_linux.go
+++ b/collector/netclass_linux.go
@@ -61,7 +61,7 @@ func NewNetClassCollector(logger log.Logger) (Collector, error) {
 func (c *netClassCollector) Update(ch chan<- prometheus.Metric) error {
         netClass, err := c.getNetClassInfo()
         if err != nil {
-                return fmt.Errorf("could not get net class info: %s", err)
+                return fmt.Errorf("could not get net class info: %w", err)
         }
         for _, ifaceInfo := range netClass {
                 upDesc := prometheus.NewDesc(
@@ -175,7 +175,7 @@ func (c *netClassCollector) getNetClassInfo() (sysfs.NetClass, error) {
         netClass, err := c.fs.NetClass()
 
         if err != nil {
-                return netClass, fmt.Errorf("error obtaining net class info: %s", err)
+                return netClass, fmt.Errorf("error obtaining net class info: %w", err)
         }
 
         for device := range netClass {