Fix warning and and test fail

idea/testData/quickfix/autoImports/falsePostfixOperator.before.Main.kt

@@ -2,7 +2,6 @@
 // ACTION: Create function 'inc'
 // ACTION: Create local variable '++'
 // ACTION: Create parameter '++'
-// ACTION: Inspection 'UNUSED_CHANGED_VALUE' options
 // ACTION: Replace overloaded operator with function call
 // ERROR: Unresolved reference: ++
 
@@ -10,7 +9,7 @@ package h
 
 trait H
 
-[suppress("UNUSED_VARIABLE")]
+[suppress("UNUSED_CHANGED_VALUE")]
 fun f(h: H?) {
     var h1 = h
     h1<caret>++