Use gofmt to simplify the code

Change-Id: I228d7335a6914dc9e90f6fdcc52e286893bddd70
diff --git a/repo_test.go b/repo_test.go
index 1dc1c61..753fd17 100644
--- a/repo_test.go
+++ b/repo_test.go
@@ -745,7 +745,7 @@
 		timestamp, err := r.timestamp()
 		c.Assert(err, IsNil)
 		for name, file := range map[string]data.FileMeta{
-			"foo.txt": data.FileMeta{
+			"foo.txt": {
 				TargetFileMeta: targets.Targets["/foo.txt"],
 				Version:        0,
 			},
diff --git a/verify/verify_test.go b/verify/verify_test.go
index 7e303e7..bab6d8f 100644
--- a/verify/verify_test.go
+++ b/verify/verify_test.go
@@ -210,7 +210,7 @@
 		}
 		if t.roles == nil {
 			t.roles = map[string]*data.Role{
-				"root": &data.Role{
+				"root": {
 					KeyIDs:    []string{t.keys[0].ID()},
 					Threshold: 1,
 				},