FIR: optimize caching in JVM deserializer

compiler/fir/java/src/org/jetbrains/kotlin/fir/java/deserialization/KotlinDeserializedJvmSymbolsProvider.kt

@@ -65,6 +65,8 @@ class KotlinDeserializedJvmSymbolsProvider(
         classId: ClassId,
         parentContext: FirDeserializationContext? = null
     ): FirClassSymbol? {
+        return classesCache.getOrPut(classId) {
+            //return null
             val kotlinJvmBinaryClass = kotlinClassFinder.findKotlinClass(classId) ?: return null
             if (kotlinJvmBinaryClass.classHeader.kind != KotlinClassHeader.Kind.CLASS) return null
 
@@ -72,11 +74,12 @@ class KotlinDeserializedJvmSymbolsProvider(
             val strings = kotlinJvmBinaryClass.classHeader.strings ?: return null
             val (nameResolver, classProto) = JvmProtoBufUtil.readClassDataFrom(data, strings)
 
-        return classesCache.getOrPut(classId, { FirClassSymbol(classId) }) { symbol ->
+            val symbol = FirClassSymbol(classId)
             deserializeClassToSymbol(
                 classId, classProto, symbol, nameResolver, session, parentContext,
                 this::findAndDeserializeClass
             )
+            symbol
         }
     }