[SLC] compareSymbolPointers: result of comparison of two 'null' symbols should be 'false'

^KT-54051

analysis/symbol-light-classes/src/org/jetbrains/kotlin/light/classes/symbol/symbolLightUtils.kt

@@ -305,7 +305,8 @@ internal fun KtSymbolPointer<*>.isValid(ktModule: KtModule): Boolean = analyzeFo
 
 internal fun <T : KtSymbol> compareSymbolPointers(ktModule: KtModule, left: KtSymbolPointer<T>, right: KtSymbolPointer<T>): Boolean {
     return left === right || analyzeForLightClasses(ktModule) {
-        left.restoreSymbol() == right.restoreSymbol()
+        val leftSymbol = left.restoreSymbol()
+        leftSymbol != null && leftSymbol == right.restoreSymbol()
     }
 }