revert unneeded change

Author: rzikm

src/libraries/System.Net.Security/src/System/Net/CertificateValidationPal.Unix.cs

@@ -35,18 +35,8 @@ internal static SslPolicyErrors VerifyCertificateProperties(
                 return null;
             }
 
-            IntPtr remoteCertificate = IntPtr.Zero;
-            {
-                using var chainStack = Interop.OpenSsl.GetPeerCertificateChain((SafeSslHandle)securityContext);
-                int count = Interop.Crypto.GetX509StackFieldCount(chainStack);
-                if (count > 0)
-                {
-                    remoteCertificate = Interop.Crypto.GetX509StackField(chainStack, 0);
-                }
-            }
-
             X509Certificate2? result = null;
-
+            IntPtr remoteCertificate = Interop.OpenSsl.GetPeerCertificate((SafeSslHandle)securityContext);
             try
             {
                 if (remoteCertificate == IntPtr.Zero)