minor generation style nits

src/babel/generation/buffer.js

@@ -117,8 +117,9 @@ export default class Buffer {
 
   _removeSpacesAfterLastNewline() {
     var lastNewlineIndex = this.buf.lastIndexOf("\n");
-    if (lastNewlineIndex === -1)
+    if (lastNewlineIndex === -1) {
       return;
+    }
 
     var index = this.buf.length - 1;
     while (index > lastNewlineIndex) {

src/babel/generation/index.js

@@ -330,7 +330,6 @@ class CodeGenerator {
 
   _printComments(comments) {
     if (this.format.compact) return;
-
     if (!this.format.comments) return;
     if (!comments || !comments.length) return;