Remove redundant nil check (#2206)

Signed-off-by: computerphilosopher <bspark@jam2in.com>

collector/cpu_linux.go

@@ -142,10 +142,7 @@ func (c *cpuCollector) Update(ch chan<- prometheus.Metric) error {
 	if err := c.updateStat(ch); err != nil {
 		return err
 	}
-	if err := c.updateThermalThrottle(ch); err != nil {
-		return err
-	}
-	return nil
+	return c.updateThermalThrottle(ch)
 }
 
 // updateInfo reads /proc/cpuinfo

collector/drm_linux.go

@@ -99,11 +99,7 @@ func NewDrmCollector(logger log.Logger) (Collector, error) {
 }
 
 func (c *drmCollector) Update(ch chan<- prometheus.Metric) error {
-	if err := c.updateAMDCards(ch); err != nil {
-		return err
-	}
-
-	return nil
+	return c.updateAMDCards(ch)
 }
 
 func (c *drmCollector) updateAMDCards(ch chan<- prometheus.Metric) error {