Adjust testData to CharSequence.length transformation

compiler/testData/diagnostics/tests/smartCasts/loops/doWhile.kt

@@ -3,9 +3,9 @@ fun x(): Boolean { return true }
 public fun foo(p: String?): Int {
     // See KT-6283
     do {
-        p!!.length()
+        p!!.length
     } while (!x())
     // Do-while loop is executed at least once, so
     // p should be not null here
-    return <!DEBUG_INFO_SMARTCAST!>p<!>.length()
+    return <!DEBUG_INFO_SMARTCAST!>p<!>.length
 }