Replaced >= with > in condition. (#14825)

src/Mvc/Mvc.DataAnnotations/src/DataAnnotationsMetadataProvider.cs

@@ -481,7 +481,7 @@ namespace Microsoft.AspNetCore.Mvc.DataAnnotations
             // See: https://github.com/dotnet/roslyn/blob/master/docs/features/nullable-reference-types.md#annotations
             if (nullableAttribute.GetType().GetField(NullableFlagsFieldName) is FieldInfo field &&
                 field.GetValue(nullableAttribute) is byte[] flags &&
-                flags.Length >= 0 &&
+                flags.Length > 0 &&
                 flags[0] == 1) // First element is the property/parameter type.
             {
                 isNullable = true;