Simplify breakIntoParts a bit

Summary: Applying hick209's recommendation to this function

Reviewed By: hick209

Differential Revision: D35439998

fbshipit-source-id: d976c4933a88a96b3094b429a2477e081cad3c5d

core/src/main/java/com/facebook/ktfmt/format/KotlinInputAstVisitor.kt

@@ -558,20 +558,17 @@ class KotlinInputAstVisitor(
 
     // use an ArrayDeque and add elements to the beginning so the innermost expression comes first
     // foo.bar.yay -> [yay, bar.yay, foo.bar.yay]
-    parts.addFirst(expression)
 
     var node: KtExpression? = expression
     while (node != null) {
+      parts.addFirst(node)
       node =
           when (node) {
             is KtQualifiedExpression -> node.receiverExpression
             is KtArrayAccessExpression -> node.arrayExpression
             is KtPostfixExpression -> node.baseExpression
             else -> null
           }
-      if (node != null) {
-        parts.addFirst(node)
-      }
     }
 
     return parts.toList()