Apply suggestions from code review

Author: baywet

src/Microsoft.OpenApi.OData.Reader/Common/EdmModelHelper.cs

@@ -365,13 +365,10 @@ internal static string StripOrAliasNamespacePrefix(IEdmSchemaElement element, Op
                 namespaceAlias = model.GetNamespaceAlias(namespaceName);
             }         
 
-            if (element is IEdmStructuredType)
-            {                
-                if (settings.EnableAliasForTypeCastSegments && !string.IsNullOrEmpty(namespaceAlias))
-                {
-                    // Alias type cast segment name
-                    segmentName = namespaceAlias.TrimEnd('.') + "." + element.Name;
-                }
+            if (element is IEdmStructuredType && settings.EnableAliasForTypeCastSegments && !string.IsNullOrEmpty(namespaceAlias))
+            {
+                // Alias type cast segment name
+                segmentName = namespaceAlias.TrimEnd('.') + "." + element.Name;
             }
 
             if (element is IEdmOperation)

src/Microsoft.OpenApi.OData.Reader/Edm/ODataTypeCastSegment.cs

@@ -51,10 +51,9 @@ public override string GetPathItemName(OpenApiConvertSettings settings, HashSet<
     {
         Utils.CheckArgumentNull(settings, nameof(settings));
 
-        IEdmSchemaElement element = StructuredType as IEdmSchemaElement;
 
-        return element != null && _model != null
+        return StructuredType is IEdmSchemaElement element && _model != null
             ? EdmModelHelper.StripOrAliasNamespacePrefix(element, settings, _model)
-            : (element?.FullName());
+            : (StructuredType.FullName());
     }
 }