Fix up powersupplyclass error

Switch to go `%w` error verb and errors.Is().

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

1 files changed, 3 insertions, 2 deletions

diff --git a/collector/powersupplyclass.go b/collector/powersupplyclass.go
index 368235e..309b08c 100644
--- a/collector/powersupplyclass.go
+++ b/collector/powersupplyclass.go
@@ -17,6 +17,7 @@
 package collector
 
 import (
+        "errors"
         "fmt"
         "os"
         "regexp"
@@ -55,7 +56,7 @@ func NewPowerSupplyClassCollector(logger log.Logger) (Collector, error) {
 func (c *powerSupplyClassCollector) Update(ch chan<- prometheus.Metric) error {
         powerSupplyClass, err := getPowerSupplyClassInfo(c.ignoredPattern)
         if err != nil {
-                if os.IsNotExist(err) {
+                if errors.Is(err, os.ErrNotExist) {
                         return ErrNoData
                 }
                 return fmt.Errorf("could not get power_supply class info: %s", err)
@@ -188,7 +189,7 @@ func getPowerSupplyClassInfo(ignore *regexp.Regexp) (sysfs.PowerSupplyClass, err
         powerSupplyClass, err := fs.PowerSupplyClass()
 
         if err != nil {
-                return powerSupplyClass, fmt.Errorf("error obtaining power_supply class info: %s", err)
+                return powerSupplyClass, fmt.Errorf("error obtaining power_supply class info: %w", err)
         }
 
         for device := range powerSupplyClass {