[AA K2] KtFirBackingFieldSymbolPointer: cleanup code

^KT-54311

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/symbols/pointers/KtFirBackingFieldSymbolPointer.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -18,10 +18,11 @@ internal class KtFirBackingFieldSymbolPointer(
     @Deprecated("Consider using org.jetbrains.kotlin.analysis.api.KtAnalysisSession.restoreSymbol")
     override fun restoreSymbol(analysisSession: KtAnalysisSession): KtBackingFieldSymbol? {
         require(analysisSession is KtFirAnalysisSession)
-        @Suppress("DEPRECATION")
-        val propertySymbol = propertySymbolPointer.restoreSymbol(analysisSession) ?: return null
+        val propertySymbol = with(analysisSession) {
+            propertySymbolPointer.restoreSymbol()
+        } ?: return null
+
         check(propertySymbol is KtFirKotlinPropertySymbol)
         return analysisSession.firSymbolBuilder.variableLikeBuilder.buildBackingFieldSymbolByProperty(propertySymbol.firSymbol)
     }
 }
-