code style simplify for context package

@@ -155,8 +155,11 @@ func (ctx *Context) CheckXsrfCookie() bool {
 	}
 	if token == "" {
 		ctx.Abort(403, "'_xsrf' argument missing from POST")
-	} else if ctx._xsrf_token != token {
+		return false
+	}
+	if ctx._xsrf_token != token {
 		ctx.Abort(403, "XSRF cookie does not match POST argument")
+		return false
 	}
 	return true
 }

@@ -72,11 +72,11 @@ func (input *BeegoInput) Site() string {
 func (input *BeegoInput) Scheme() string {
 	if input.Request.URL.Scheme != "" {
 		return input.Request.URL.Scheme
-	} else if input.Request.TLS == nil {
+	}
+	if input.Request.TLS == nil {
 		return "http"
-	} else {
-		return "https"
 	}
+	return "https"
 }
 
 // Domain returns host name.