fix golint issues (#458)

rest/engine.go

@@ -155,15 +155,16 @@ func (s *engine) createMetrics() *stat.Metrics {
 func (s *engine) getLogHandler() func(http.Handler) http.Handler {
 	if s.conf.Verbose {
 		return handler.DetailedLogHandler
-	} else {
-		return handler.LogHandler
 	}
+
+	return handler.LogHandler
 }
 
 func (s *engine) getShedder(priority bool) load.Shedder {
 	if priority && s.priorityShedder != nil {
 		return s.priorityShedder
 	}
+
 	return s.shedder
 }
 
@@ -177,11 +178,11 @@ func (s *engine) signatureVerifier(signature signatureSetting) (func(chain alice
 	if len(signature.PrivateKeys) == 0 {
 		if signature.Strict {
 			return nil, ErrSignatureConfig
-		} else {
-			return func(chain alice.Chain) alice.Chain {
-				return chain
-			}, nil
 		}
+
+		return func(chain alice.Chain) alice.Chain {
+			return chain
+		}, nil
 	}
 
 	decrypters := make(map[string]codec.RsaDecrypter)
@@ -200,10 +201,10 @@ func (s *engine) signatureVerifier(signature signatureSetting) (func(chain alice
 		if s.unsignedCallback != nil {
 			return chain.Append(handler.ContentSecurityHandler(
 				decrypters, signature.Expiry, signature.Strict, s.unsignedCallback))
-		} else {
-			return chain.Append(handler.ContentSecurityHandler(
-				decrypters, signature.Expiry, signature.Strict))
 		}
+
+		return chain.Append(handler.ContentSecurityHandler(
+			decrypters, signature.Expiry, signature.Strict))
 	}, nil
 }