Drop result value if it's not needed

idea/testData/refactoring/inline/function/expressionBody/ComplexArgumentUsedTwice.kt

@@ -3,6 +3,6 @@ fun <caret>f(p: Int) = p + p
 fun complexFun(): Int {
 }
 
-fun main(args: Array<String>) {
-    f(complexFun())
+fun g(): Int {
+    return f(complexFun())
 }

idea/testData/refactoring/inline/function/expressionBody/ComplexArgumentUsedTwice.kt.after

@@ -1,7 +1,7 @@
 fun complexFun(): Int {
 }
 
-fun main(args: Array<String>) {
+fun g(): Int {
     val p = complexFun()
-    p + p
+    return p + p
 }