Redundant nullable return type: false negative with return expression in local function or lambda

#KT-41817 Fixed

idea/testData/inspectionsLocal/redundantNullableReturnType/function/returnNullableForLambda.kt

@@ -0,0 +1,7 @@
+// WITH_RUNTIME
+fun test(list: List<Int>): Int?<caret> {
+    val x = list.mapNotNull {
+        return@mapNotNull null
+    }
+    return 1
+}

idea/testData/inspectionsLocal/redundantNullableReturnType/function/returnNullableForLambda.kt.after

@@ -0,0 +1,7 @@
+// WITH_RUNTIME
+fun test(list: List<Int>): Int {
+    val x = list.mapNotNull {
+        return@mapNotNull null
+    }
+    return 1
+}

idea/testData/inspectionsLocal/redundantNullableReturnType/function/returnNullableForLocalFunction.kt

@@ -0,0 +1,6 @@
+fun test(): Int?<caret> {
+    fun f(): Int? {
+        return null
+    }
+    return 1
+}

idea/testData/inspectionsLocal/redundantNullableReturnType/function/returnNullableForLocalFunction.kt.after

@@ -0,0 +1,6 @@
+fun test(): Int {
+    fun f(): Int? {
+        return null
+    }
+    return 1
+}