[FIR] Fix false positive RETURN_TYPE_MISMATCH in intellij ultimate

compiler/fir/analysis-tests/testData/resolveWithStdlib/diagnostics/functionReturnTypeMismatchChecker/basic.kt

@@ -37,7 +37,7 @@ fun errorWithLambda(): String {
         return@foo
     } foo {
         bar()
-        return@foo <!RETURN_TYPE_MISMATCH!>10<!>
+        return@foo 10
     }
 
     return ""

compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/expression/FirFunctionReturnTypeMismatchChecker.kt

@@ -25,9 +25,7 @@ object FirFunctionReturnTypeMismatchChecker : FirReturnExpressionChecker() {
     override fun check(expression: FirReturnExpression, context: CheckerContext, reporter: DiagnosticReporter) {
         if (expression.source == null) return
         val targetElement = expression.target.labeledElement
-        if (targetElement is FirErrorFunction ||
-            targetElement is FirAnonymousFunction && targetElement.isLambda && expression.target.labelName == null
-        ) {
+        if (targetElement is FirErrorFunction || targetElement is FirAnonymousFunction && targetElement.isLambda) {
             return
         }
         val resultExpression = expression.result