Fix misuses of format based logging functions

Signed-off-by: Tõnis Tiigi <tonistiigi@gmail.com> (github: tonistiigi)
Upstream-commit: 6705477673be7c303369778f6f288ee600ce3893
Component: engine

components/engine/daemon/graphdriver/graphtest/graphtest.go

@@ -33,7 +33,7 @@ func newDriver(t *testing.T, name string) *Driver {
 	d, err := graphdriver.GetDriver(name, root, nil)
 	if err != nil {
 		if err == graphdriver.ErrNotSupported || err == graphdriver.ErrPrerequisites {
-			t.Skip("Driver %s not supported", name)
+			t.Skipf("Driver %s not supported", name)
 		}
 		t.Fatal(err)
 	}