daemon: fix perfsprint linting

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

daemon/daemon_unix.go

@@ -502,7 +502,7 @@ func verifyPlatformContainerResources(resources *containertypes.Resources, sysIn
 		return warnings, errors.New("CPU cfs quota can not be less than 1ms (i.e. 1000)")
 	}
 	if resources.CPUPercent > 0 {
-		warnings = append(warnings, fmt.Sprintf("%s does not support CPU percent. Percent discarded.", runtime.GOOS))
+		warnings = append(warnings, runtime.GOOS+" does not support CPU percent. Percent discarded.")
 		resources.CPUPercent = 0
 	}
 

daemon/hosts.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"crypto/tls"
 	"crypto/x509"
-	"fmt"
 	"net/http"
 	"net/url"
 	"os"
@@ -90,7 +89,7 @@ func mirrorsToRegistryHosts(mirrors []string, dHost docker.RegistryHost) []docke
 
 		u, err := url.Parse(mirror)
 		if err != nil || u.Host == "" {
-			u, err = url.Parse(fmt.Sprintf("dummy://%s", mirror))
+			u, err = url.Parse("dummy://" + mirror)
 		}
 		if err == nil && u.Host != "" {
 			h.Host = u.Host

daemon/mounts.go

@@ -89,7 +89,7 @@ func (daemon *Daemon) removeMountPoints(container *container.Container, rm bool)
 					continue
 				}
 			} else {
-				rmErrors = append(rmErrors, fmt.Sprintf("layer not found for image %s", m.Name))
+				rmErrors = append(rmErrors, "layer not found for image "+m.Name)
 			}
 		}
 	}