daemon: return directly without ifs where possible

Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com>

daemon/daemon_windows.go

@@ -204,10 +204,7 @@ func verifyPlatformContainerSettings(daemon *Daemon, hostConfig *containertypes.
 
 	w, err := verifyContainerResources(&hostConfig.Resources, hyperv)
 	warnings = append(warnings, w...)
-	if err != nil {
-		return warnings, err
-	}
-	return warnings, nil
+	return warnings, err
 }
 
 // platformReload update configuration with platform specific options

daemon/graphdriver/devmapper/deviceset.go

@@ -380,10 +380,7 @@ func (devices *DeviceSet) isDeviceIDFree(deviceID int) bool {
 	var mask byte
 	i := deviceID % 8
 	mask = (1 << uint(i))
-	if (devices.deviceIDMap[deviceID/8] & mask) != 0 {
-		return false
-	}
-	return true
+	return (devices.deviceIDMap[deviceID/8] & mask) == 0
 }
 
 // Should be called with devices.Lock() held.
@@ -1400,10 +1397,7 @@ func (devices *DeviceSet) saveTransactionMetaData() error {
 }
 
 func (devices *DeviceSet) removeTransactionMetaData() error {
-	if err := os.RemoveAll(devices.transactionMetaFile()); err != nil {
-		return err
-	}
-	return nil
+	return os.RemoveAll(devices.transactionMetaFile())
 }
 
 func (devices *DeviceSet) rollbackTransaction() error {
@@ -2408,11 +2402,7 @@ func (devices *DeviceSet) UnmountDevice(hash, mountPath string) error {
 	}
 	logrus.Debug("devmapper: Unmount done")
 
-	if err := devices.deactivateDevice(info); err != nil {
-		return err
-	}
-
-	return nil
+	return devices.deactivateDevice(info)
 }
 
 // HasDevice returns true if the device metadata exists.

daemon/graphdriver/windows/windows.go

@@ -775,11 +775,7 @@ func (d *Driver) resolveID(id string) (string, error) {
 
 // setID stores the layerId in disk.
 func (d *Driver) setID(id, altID string) error {
-	err := ioutil.WriteFile(filepath.Join(d.dir(id), "layerId"), []byte(altID), 0600)
-	if err != nil {
-		return err
-	}
-	return nil
+	return ioutil.WriteFile(filepath.Join(d.dir(id), "layerId"), []byte(altID), 0600)
 }
 
 // getLayerChain returns the layer chain information.

daemon/logger/etwlogs/etwlogs_windows.go

@@ -155,8 +155,5 @@ func callEventWriteString(message string) error {
 
 func callEventUnregister() bool {
 	ret, _, _ := procEventUnregister.Call(uintptr(providerHandle))
-	if ret != win32CallSuccess {
-		return false
-	}
-	return true
+	return ret == win32CallSuccess
 }

daemon/logger/fluentd/fluentd.go

@@ -182,11 +182,8 @@ func ValidateLogOpt(cfg map[string]string) error {
 		}
 	}
 
-	if _, err := parseAddress(cfg["fluentd-address"]); err != nil {
-		return err
-	}
-
-	return nil
+	_, err := parseAddress(cfg["fluentd-address"])
+	return err
 }
 
 func parseAddress(address string) (*location, error) {

daemon/logger/gelf/gelf.go

@@ -172,11 +172,8 @@ func ValidateLogOpt(cfg map[string]string) error {
 		}
 	}
 
-	if _, err := parseAddress(cfg["gelf-address"]); err != nil {
-		return err
-	}
-
-	return nil
+	_, err := parseAddress(cfg["gelf-address"])
+	return err
 }
 
 func parseAddress(address string) (string, error) {