Redundant null-check

Author: SergeiPavlov

Orm/Xtensive.Orm/Orm/Linq/Materialization/MaterializationContext.cs

@@ -88,12 +88,7 @@ public TypeMapping GetTypeMapping(int entityIndex, TypeInfo approximateType, int
       return result;
     }
 
-    private int ResolveTypeToNodeSpecificTypeIdentifier(TypeInfo typeInfo)
-    {
-      ArgumentNullException.ThrowIfNull(typeInfo);
-      return TypeIdRegistry[typeInfo];
-    }
-
+    private int ResolveTypeToNodeSpecificTypeIdentifier(TypeInfo typeInfo) => TypeIdRegistry[typeInfo];
 
     // Constructors