KT-5971 Missing error when fun argument is safe call

#KT-5971 Fixed

compiler/testData/diagnostics/tests/resolve/nestedCalls/kt5971NestedSafeCall.kt

@@ -0,0 +1,9 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+//KT-5971 Missing error when fun argument is safe call
+
+fun foo(i: Int) {}
+
+fun test(s: String?) {
+    foo(<!TYPE_MISMATCH!>s?.length<!>)
+}

compiler/testData/diagnostics/tests/resolve/nestedCalls/kt5971NestedSafeCall.txt

@@ -0,0 +1,4 @@
+package
+
+internal fun foo(/*0*/ i: kotlin.Int): kotlin.Unit
+internal fun test(/*0*/ s: kotlin.String?): kotlin.Unit